2. Atoms & Elements

How many protons are present in an atom of oxygen?

How many atoms are present in a molecule of hydrogen (H_2)?

Which subatomic particles move rapidly around the nucleus of an atom?

Which element has a neutral atom containing 17 electrons?

Which of the following atoms is expected to be the most chemically reactive?

Ozone is a molecule in the upper atmosphere that is made up of three atoms of _____.

How many electrons are present in a neutral atom of carbon?

How many protons are present in a neutral atom of carbon?

Which statement correctly describes the distribution of electrons in a water molecule?

Which of the following best describes an element?

What is the overall charge of a neutral atom?

How many protons are present in an atom of cobalt (Co)?

Which statement correctly describes the structure of an atom?

When are atoms most stable?

Why is it impossible for an element to have an atomic number of 110.5?