An electrically neutral atom of beryllium has four protons. Which statement is true?

There is a charge of +4 on an atom of beryllium.

There is a charge of −4on an atom of beryllium.

There are four neutrons in the nucleus.

There are four protons in the nucleus.

What is the chemical formula of the following compound

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

Explain which atom l or m is more stable and why