Atoms Test Review

Which statement describes the charge and location of an electron in an atom?

• An electron has a positive charge and is located outside the nucleus.

• An electron has a positive charge and is located in the nucleus.

• An electron has a negative charge and is located outside the nucleus.

• An electron has a negative charge and is located in the nucleus.

Which statement explains why a xenon atom is electrically neutral?

• The atom has fewer neutrons than electrons.

• The atom has more protons than electrons.

• The atom has the same number of neutrons and electrons.

• The atom has the same number of protons and electrons.

What is the approximate mass of an atom that contains 26 protons, 26 electrons and 19 neutrons?

• 26 u

• 45 u

• 52 u

• 71 u

Which particle diagram represents a mixture?

• 
• 
• 
• 

According to the wave-mechanical model, an orbital is defined as the most probable location of

• a proton

• a neutron

• a positron

• an electron

The part of an atom that has an overall positive charge is called

• an electron

• the nucleus

• the first shell

• the valence shell

Tags

NGSS.HS-PS1-8

Which subatomic particles each have a mass of approximately 1 u?

• proton and electron

• proton and neutron

• neutron and electron

• neutron and positron

The elements on the Periodic Table of the Elements are arranged in order of increasing

• atomic mass

• formula mass

• atomic number

• oxidation number

Which element is classified as a metalloid?

• Te

• S

• Hg

• I

Which substance can be broken down by chemical means?

• ammonia

• aluminum

• antimony

• argon