Atoms and Atomic Structure Review

At the center of every atom lies a small, dense ___ that is positively charged.

• cloud

• neutron

• nucleus

• orbital

How many electrons are in an electrically neutral atom of boron?

• 3

• 5

• 6

• 8

Tags

NGSS.MS-PS1-1

An atom of the element ___ has an average atomic mass of about 16 amu.

• oxygen

• sulfur

• nitrogen

• no elements have that mass

Tags

NGSS.MS-PS1-1

Chlorine is the atomic number 17 in the periodic table of the elements. What information does the atomic number give you about the element chlorine?

• An atom of chlorine has 17 protons⁺.

• An atom of chlorine has 17 protons⁺ and electrons^-.

• An atom of chlorine has 17 protons⁺ and neutrons⁺.

• Chlorine atom have 17 of each of the three subatomic particles: protons, neutrons, and electrons.

Tags

NGSS.MS-PS1-1

Twenty is the ___ of potassium.

• charge

• atomic mass

• atomic number

• number of neutrons

Which of the diagrams is the correct model for the element beryllium?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

Elements in the same group/family of the periodic table are similar in what way?

• They are all metals.

• They are all nonmetals.

• They have a full outer shell of electrons.

• They have the same number of valence electrons.

The atoms in a sample of carbon must contain nuclei with the same number of

• electrons.

• neutrons.

• nucleolus.

• protons.

The nucleus of the atom contains the greatest concentration of mass of an atom. Which arrow is pointing at the nucleus of Nitrogen?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

When studying the halogens (group 17) on the periodic table, how does the number of valence electrons change as the energy level is increased?

• The total number of valence electrons does not change, it remains 7.

• The total number of valence electrons does not change, it remains 1.

• The total number of valence electrons increases by 1 with each energy level.

• The total number of valence electrons decreases by 1 with each energy level.

Tags

NGSS.MS-PS1-1