The group number for the representative elements tells you...

• how many protons the atom has.

• how many valence electrons in the atom.

• the amount of isotopes each atom has.

• the number of core electrons in the atom.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Match the following atoms with the appropriate amount of valence electrons

• 6

• Mg

• 2

• N

• 7

• K

• 1

• S

• 5

• Br

Tags

NGSS.HS-PS1-1

Negatively charged ions are called...

Positively charged ions are called...

• anion

• cation

• gained one valence electron

• lost one valence electron

• gained two valence electrons

• didn't gain or lose any valence electrons.

Answer explanation

The superscript tells us everything!

1. the plus sign means its a cation

2. the number 1 (which isn't written but assumed) tells us one valence electron is lost

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

​ (a)   and ​ (b)   react to form ​ (c)   . The ​metal atom ​ (d)   valence electrons to the nonmetal, which ​ (e)   valence electrons.

• Metals
• nonmetals
• ionic compounds
• gives
• gains
• Noble gases
• metallic compounds
• alloys
• electronic compounds
• hexagonal structures

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which ion is the metal in the ionic compound given?

Answer explanation

The metal cation is always first in the chemical formula for ionic compounds.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Match the following

• valence electron

• atoms tend to react so as to acquire the stable electron configuration of a noble gas

• ionic bonds

• diagram that shows valence electrons as dots

• octet rule

• electrons in the highest occupied energy level or an element's atom

• electron dot structure

• electrostatic attraction that binds oppositely charged ions

• metallic bonds

• attraction of free-floating valence electrons for positively charged cations

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Match the following cation/anion with how many valence electrons it lost/gained.

• gained 2 valence electrons

• lost two valence electrons

• gained one valence electron

• lost one valence electron

• lost three valence electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2