REVIEW - ATOMIC STRUCTURE

The mass of an electron is

• equal to the mass of a proton

• greater than the mass of a proton

• equal to the mass of a neutron

• less than the mass of a neutron

Which particles are found in the nucleus of an argon atom?

• protons and electrons

• protons and neutrons

• positrons and neutrons

• positrons and electrons

Atoms are neutral because the number of

• protons equals the number of neutrons

• protons equals the number of electrons

• neutrons is greater than the number of protons

• neutrons is greater than the number of electrons

What is the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons?

• 1+

• 2+

• 1-

• 2-

The table below shows the number of protons, neutrons, and electrons in four ions.

Which ion has a charge of 2–?

• A

• E

• G

• J

Tags

NGSS.MS-PS2-3

An ion that consists of 7 protons, 9 neutrons, and 10 electrons has a net charge of

• 2-

• 2+

• 3+

• 3-

The mass of a proton is approximately equal to the mass of

• an electron

• a neutron

• an alpha particle

• a beta particle

Which phrase describes an Aluminum atom?

• a negatively charged nucleus, surrounded by negatively charged electrons

• a negatively charged nucleus, surrounded by positively charged electrons

• a positively charged nucleus, surrounded by negatively charged electrons

• a positively charged nucleus, surrounded by positively charged electrons

On the Periodic Table, the number of protons in an atom of an element is indicated by its

• atomic mass

• atomic number

• selected oxidation states

• number of valence electrons

Every chlorine atom has

• 7 electrons

• 17 neutrons

• a mass number of 35

• an atomic number of 17