Chemistry Quiz 3 Practice

Which of the following is true about subatomic particles?

• Electrons are negatively charged and are the heaviest subatomic particles

• Protons are positively charged and the lightest subatomic particles

• Neutrons have no charge and are the lightest subatomic particle.

• The mass of a neutron nearly equals the mas of a proton.

The particles that are found in a nucleus of an atom are

• neutrons and electrons

• electrons only

• protons and neutrons

• protons and electrons

The nucleus of an atom is

• the central core and is composed of protons and neutrons

• positively charged and has more protons than neutrons

• negatively charged and has a high density

• negatively charged and has a low density

The atomic number of an element is the total number of which particles in the nucleus?

• neutrons

• protons

• electrons

• protons and electrons

An element has an atomic number of 86. The number of protons and electrons in a neutral atom of the element are ______________.

• 172 protons and 86 electrons

• 86 protons and 0 electrons

• 43 protons and 43 electrons

• 86 protons and 86 electrons

The sum of the protons and neutrons in an atom equals the

• atomic number

• nucleus number

• atomic mass

• mass number

What does the number 56 mean in oxygen-56 represent?

• the atomic number

• the mass number

• the sum of the protons and electrons

• twice the number of protons

All atoms of the same element have the same

• number of neutrons

• number of protons

• mass numbers

• atomic mass

Isotopes of the same element have different

• numbers of neutrons

• number of protons

• number of electrons

• atomic numbers

Isotopes of the same element have different

• positions on the periodic table

• chemical behavior

• atomic numbers

• mass numbers