Chapter 4

Anything that takes up space is called ...1..

The pull of gravity on the mass of a substance is known as ..2..

The smallest part of an element that retains the properties of the element is the ..3..

A substance made of two or more kinds of atoms is a (an) .....

Charged particles that rotate around the nucleus of an atom are called (a) electricity (c) electrons (b) protons (d) energy

The atomic mass number of an element is obtained by adding together the number of (a) protons and electrons (c) electrons and nuclei (b) electrons and neutrons (d) protons and neutrons

Isotopes of an element differ in the number of (a) protons (c) electrons (b) neutrons (d) electrical particles

Of the following, a true statement about an atom is (a) an atom has excess electric charges (b) an atom has an unstable nucleus (c) the energy shells are visible inside the nucleus (d) an atom is electrically neutral

Most hydrogen atoms lack a (an) (a) proton (c) nucleus (b) neutron (d) electron

A pair of shared electrons forms a (an) (a) covalent bond (e) unstable bond (b) ionic bond (d) radioactive bond

The force that holds atoms together is known as a (an) (a) atomic bond (c) isotopic bond (b) chemical bond (d) covalent bond

The sodium ion is represented by the symbol (a) \(\mathrm{So}^{+}\) (c) \(\mathrm{Na}^{+}\) (b) \(\mathrm{So}^{-}\) (d) \(\mathrm{Na}^{-}\)

In a chemical formula, each element is represented by its (a) atomic number (c) atomic mass (b) chemical symbol (d) electric charge

Covalent bonding occurs between atoms in (a) calcium (c) salt (b) sodium (d) water

The proportions in which atoms combine are shown by numbers called (a) superscripts (c) exponents (b) subseripts (d) primes