2. Atoms & Elements

Which of the following determines the identity of an element?

Why can't an atom easily lose or gain a proton under normal chemical reactions?

Which of the following is the number of protons in an atom of sodium (Na)?

Where were the atoms in the plastic of your chair originally formed?

Given a diagram of an atom showing 6 protons, 6 neutrons, and 6 electrons, which of the following correctly completes the table for atomic number, mass number, and element symbol?

How many protons are present in a neutral chlorine (Cl) atom?

How many protons are present in a hydrogen atom?

An atom would become a different element if which of the following characteristics changed?

Which of the following elements has exactly 8 protons in its nucleus?

What is the mass number of an atom that contains 5 protons and 7 neutrons?

Which subatomic particles do not affect the stability of the atom?

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

How many electron shells are present in a neutral sulfur atom?

Which of the following atoms would be electrically neutral?

Which of the following is the number of neutrons in the most abundant isotope of boron?