Which of these elements has two electrons in its outer p orbitals?

helium (He)

barium (Ba)

nitrogen (N)

silicon (Si)

sulfur (S)

Which was a testable idea that J. J. Thomson developed through his experiments? Atoms are the most important substances in the universe. It is impossible to divide an atom into smaller parts. There are electrically neutral particles inside atoms.

How does nitrogen get recycled back to the atmosphere

What does the atomic number on the periodic table represent for each atom

Choose all the answers that apply. According to Newton's laws of motion: objects at rest will stay at rest objects in motion will come to rest once force is removed forces occur in pairs of equal magnitude and direction an increase in mass will

Which layer of the atmosphere is between the stratosphere and the thermosphere

How to calculate average concentration

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?