why does helium have 2 valence electrons

why does helium have 2 valence electrons

We've navigated through the s-block. We've trekked through the d-block. And now we've reached the last column of the p-block. Welcome to the noble gases. The noble gases: group 8. There are six gaseous elements located in group 8A (or group 18) of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Collectively these gases are known as the noble gases. These gases are not heir to the throne nor are they superior in morals. The noble part of their name actually arises from the German word edelgas, which means unreactive. We've mentioned a gazillion times that other elements strive to achieve the stability of the noble gases, but where does this stability come from? ...

 why does my car squeak when i turn the wheel

why does my car squeak when i turn the wheel

CARS. COM So you ve just gotten comfortable behind the wheel, put your belt on, lifted off the brakes and you re ready to head out when you notice your steering causes an alarming noise. Luckily, you aren t the first to encounter such sounds. If your car is making a squealing or squeaking sound when turning the steering wheel, there could be any of several culprits at play, and it s important to get the problem checked out with a car mechanic. Related: One common cause is low power-steering fluid, which affects how your steering wheel feels and sounds. When the fluid that powers and lubricates conventional power-steering systems in a car gets low, it can lead to a squealing noise that may sustain for as long as the car s steering wheel remains off-center. It can also be fairly loud.

 why does my hot water heater make noise

why does my hot water heater make noise

My hot water heater is making weird noises!?! November 20, 2017, Common reasons why your hot water heater is making strange noises. Hot water heaters make noise whilst they go about their job of heating cold water and sending to your pipes and appliances. P If you notice a change in the noises coming from your hot water heater or it because increasingly audible each time you turn on the hot water tap, then it might be a good time do some further investigation. Gurgling, crackling or popping P: These noises may be caused by the contraction and expansion of the hot water tank during normal operation. P Other causes may be due to sediment build up that may trap water under a film of caked build up. When the water heats up it is forced through a small hole and may make a popping sound.

 why does my dog keep coughing and choking

why does my dog keep coughing and choking

I did a little digging as I have not experienced this issue personally and found some info. Just in case its probably best to take your dog to the vet as some causes can be serious health concerns. In small breeds coughing can be 'Reverse sneezing'. In a reverse sneeze, air is instead pulled rapidly and noisily in through the nose sounding like a cough. If the condition is chronic you should make a vet appointment. Reoccurring coughing episodes can also be a sign of a collapsing trachea (also common in small breeds). This is a progressive condition and should be looked into by a vet. In all breeds Heart disease, Pneumonia, kennel cough, and items logged in a dogs throat are all accompanied by a cough as well. ...

 why do my ribs hurt when i breathe in

why do my ribs hurt when i breathe in

Long-term pain caused by costochondritis can be debilitating if untreated. Normally, treatment of the inflammation and pain causes costochondritis to eventually go away on its own. If you have chronic costochondritis, the pain may return в even with treatment в when you exercise or engage in certain activities. In these cases, you may need to seek long-term care to make sure that costochondritis doesnвt affect your quality of life and ability to take part in daily activities. Pains associated with costochondritis can indicate other issues. Chest pains can often mean that youвre having heart issues, so see your doctor right away when you feel pain in your chest to make sure that youвre not having a heart attack or have. The chest pain associated with costochondritis is a common symptom of.

 why does cigarette smoke give me a headache

why does cigarette smoke give me a headache

Maybe you just spent an evening out with friends who can't get through an hour without lighting up. Or perhaps you're a regular smoker yourself. Either way, you're now trying to deal with a pounding that's got you holding your brow. Did all that smoke, you wonder, trigger the you're feeling? Whether you smoke cigarettes, or pipes -- or hang around with people who do -- there's a chance that is the source of your woes. The chemicals in tobacco and the smell of the smoke are a big part of the problem. But if you take the right steps you can help keep some of your at bay. How does smoking and secondhand smoke cause headaches? There are several ways that is linked to Nicotine. It's a chemical in tobacco products. When you smoke, nicotine causes the blood vessels in your body to narrow. This

 why does my heels hurt so bad

why does my heels hurt so bad

is a foot condition in which a band of tissue in the sole of the foot becomes inflamed, leading to severe heel pain. The pain of plantar fasciitis can be so bad that it hurts to walk, much less exercise or do daily activities. But a few simple changes and precautions at home can help reduce the pain in your heels. Plantar Fasciitis Treatment: Tips at Home If heel pain is keeping you down, pamper your a bit until they're feeling better again. To relieve the pain of plantar fasciitis: Use an ice pack to reduce swelling, inflammation, and pain. Take an over-the-counter pain reliever, like ibuprofen or acetaminophen. Rest your feet by staying off of them as much as possible for a few days when your heels are aching. Some good foot flexing and stretches can help stretch out the plantar

 why does my cat vomit all the time

why does my cat vomit all the time

After I graduated from college, I borrowed one of my family s cats to keep me company in my new apartment. One morning after she had breakfast, she vomited. After supper, she did it again. The next day, the same thing happened. I freaked out. I called a vet clinic, explained in a shaking voice what was happening I was sure she was dying! and got an appointment the next morning. A quick consultation later, the vet sent me home with a tube of Petromalt, and after the first dose she ejected the biggest hairball I d ever seen. Actually, most cat vomiting is caused by fairly innocuous things, and here are the top culprits. 1. Hairballs When your cat grooms himself, loose hairs get stuck on the little comblike barbs on his tongue. Because he can t spit that fur out, he swallows it, and if too

 why does california have oil and natural gas resources

why does california have oil and natural gas resources

The total cost of imported oil canБt be measured solely in dollars per barrel. The real costs include the risks associated with turmoil and violence in exporting regions, the uncertainties around transportation routes, and environmental concerns. Imported oil is not produced according to CaliforniaБs stringent environmental and safety standards. But despite that, and despite the fact that California has all the gas and oil the state needs in the ground beneath our feet, we are still importing energy in large amounts. ...

 why does the scientific method begin with observations

why does the scientific method begin with observations

How do I start? Observation is the key tool of a scientist. Observation helps a researcher to identify promising aspects of natural phenomena that are worth knowing about. The scientist is specifically looking for causal relationships in nature that (taken together with other knowledge) will help to explain in the broadest terms how natural systems work. The outcome of any observational process will be the formulation of one or more research questions (RQs). RQs are (at some level) guesses about the biological principles operating in a given situation. Todays exercise will be about the observation of Beta vulgaris L. , the common garden beet. It contains a reddish pigment called betacyanin. Betacyanin is found deep in the cells of the beetroot in a cellular organelle called the vacuole.

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