Atoms 6th Mr. S

What is the atomic number for an element with three protons?

• 2
• 1
• 3
• 6

What is the atomic symbol for sodium?

• Na
• So
• NaCl
• S

True or False? Isotopes are atoms of the same element that differ in mass number and number of neutrons

• True
• False

True or False? Neutrons have a negative charge

• True
• False

An atom's mass number equals the number of...

• protons plus the number of electrons
• protons plus the number of neutrons
• protons
• neutrons

Which statement about the atomic nucleus is correct?

• The nucleus is made of protons and neutrons and has a negative charge
• The nucleus is made of protons and neutrons and has a positive charge
• The nucleus is made of electrons and has a positive charge
• The nucleus is made of electrons and has a negative charge

Which statement best describes an electron?

• Smaller mass than a proton and a negative charge
• Smaller mass than a proton and a positive charge
• Greater mass than a proton and a negative charge
• Greater mass than a proton and a positive charge

A particle that moves around the nucleus is a(n)...

• Proton
• Neutron
• Electron
• Quark

Atoms have no electric charge because they...

• have an equal number of charged and non charged particles
• have neutrons in their nuclei
• have an equal number of electrons and protons
• have an equal number of neutrons and protons

Most of the mass in an atom is concentrated in the...

• electrons
• nucleus
• protons
• empty space