Chapter 1: Atoms and Molecules Quiz

Atom X has an atomic number of 19 and has a mass number of 39. The number of protons in atom X is equal to

19

Magnesium has 12 protons. How many electrons are in its third energy level?

2

When the outermost electrons are transferred or shared between atoms,

Chemical bonding occurs.

A(n) __________ is formed when two atoms share electrons.

Covalent bond

Radioactive isotopes have

Excess neutrons.

This attractive force, referred to as a type of chemical bond, contributes to the shape of large molecules.

Hydrogen

The atoms of the isotopes of a particular element vary in the number of:

Neutrons

Ninety-six percent of the weight of the body results from all of the following elements EXCEPT:

Potassium

A nonpolar covalent bond implies that ________.

There is no difference in charge at the ends (the two poles) of the bond

An atom that has gained or lost electrons is called an ion.

True