Element classification

How many valence electrons are in an atom of Se?

• 2
• 8
• 6
• 5

Tags

NGSS.HS-PS1-1

How many valence electrons are found in atoms of group 15?

• 4
• 5
• 2
• 3

Tags

NGSS.HS-PS1-1

• 2
• 8
• 3
• 13

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

• 2

• 3

• 5

• 7

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

NGSS.HS-PS1-4

How many valence electrons does carbon have?

• 4

• 5

• 6

• 7

Tags

NGSS.HS-PS1-1

This could be the dot diagram of

• Mg

• Cl

• C

• O

Tags

NGSS.HS-PS1-1

Columns in the periodic table are called______, rows are called_________

• Periods, groups

• Groups, periods

• Periods, shells

• Shells, groups

The period number tells us...

• How many electron shells an element has

• How many electrons are in the most outer shell

• The mass number

• The valency

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The group number tells us...

• How many electron shells an atom has

• How many electrons are in the most outer shell of an element

• The atomic mass

• Electonegativity

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

• mass number

• atomic number

• number of isotopes

• number of valence electrons