Review of Atoms, Atomic Identity, & Valence Electrons

Match the following elements to their correct description.

• Sulfur

• 
• Argon

• 
• Phosphorus

• 
• Tantalum

• 
• Arsenic

• 

Tags

NGSS.MS-PS1-1

Calcium (Ca) has atomic number of ​ ​ ​ (a)   an atomic mass of ​ ​ (b)   with 20 protons, 20 nuetrons, and ​ (c)   electrons.

• 20
• 40

Tags

NGSS.MS-PS1-1

​ (a)   (Fe) atomic number is ​ (b)   with an atomic mass of 55.845 with ​ (c)   protons, ​ (d)   neutrons, and ​ (e)   electrons.

• Iron
• 26
• 30

Tags

NGSS.MS-PS1-1

Boron (​ (a)   ) has the atomic number 5 with an atomic mass of ​ (b)   with ​ (c)   protons, ​ ​ (d)   neutrons, and ​ (e)   valence electrons.

• B
• 11
• 5
• 6
• 3

Tags

NGSS.MS-PS1-1

​ (a)   (I) atomic number is ​ (b)   with an atomic mass of ​ (c)   that has 53 protons, ​ (d)   neutrons, and ​ (e)   valence electrons.

• Iodine
• 53
• 127
• 74
• 7

Tags

NGSS.MS-PS1-1

Silicon (​ (a)   ) atomic number is 14 with an atomic mass of ​ (b)   and has ​ (c)   protons, ​ (d)   neutrons, and ​ ​ (e)   electrons.

• Si
• 28
• 14

Tags

NGSS.MS-PS1-1

True or False: An atom of Magnesium with 1 valence electron has a +1 charge.

• True

• False

True or False: An atom of Nitrogen with 7 valence electrons has a charge of -2.

• True

• False

An atom of Lithium is-

• NOT reactive as it has a full valence shell.

• NOT reactive because it has only one valence electron.

• highly reactive because it only has one valence electron.

• slightly reactive as it needs to gain one valence electron to fill its outer shell.