8th grade Chem 1 Review

The vertical (up and down) columns in the Periodic Table are called ___________

Elements in the same column of the periodic table always have the same number of ​​ (a)  

• valence electrons
• Protons
• Neutrons
• Electrons

How do you find the number of neutrons in an element?

• add the protons and electrons

• subtract the electrons from the protons

• subtract the atomic number from the atomic mass

• the number of protons and neutrons are the same

The number of energy shells in a lithium atom are ​ (a)  

• 2
• 6
• 9
• 3
• 5

Tags

NGSS.MS-PS1-1

The element Gold is found in period​ (a)   , which means gold has ​ (b)   energy shells

• 6
• (6)
• 7
• 9
• 1
• (7)
• (9)
• (1)

Beryllium has an atomic number of 4 and an atomic mass of 9.012. How many neutrons does Beryllium have?

• 4

• 5

• 9

• 13

Match the following

• Sodium

• 
• Argon

• 
• Neon

• 
• Beryllium

• 
• Lithium

• 

Tags

NGSS.MS-PS1-1

How many valence electrons are in this element?

• 7

• 2

• 4

• 3

Calculate the number of neutrons for this element.

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

The symbol for iodine is ​ (a)   this element is found in group ​ (b)   period ​ (c)   . This element has ​ (d)   valence electrons and ​ (e)   energy shells. This element has ​ undefined   protons,​ undefined   electrons, and ​ undefined   neutrons.

• I
• 17
• 5
• 7
• 53
• 74