Chapter 18 Review

The _____________ tells us which elements a compound contains and the number of atoms of each element.

• Chemical Bond

• Chemical Formula

• Covalent Bond

• Ionic Bond

Tags

NGSS.MS-PS1-1

According to the image, how many atoms of each element are present?

• 2 hydrogens, 1 oxygen

• 1 hydrogen, 2 oxygens

• 1 hydrogen, 1 oxygen

• 2 hydrogen, 2 oxygen

Tags

NGSS.MS-PS1-1

Why are noble gases stable?

• They have a full valence shell

• They contain 8 valence electrons

• All of the above are correct

All elements on the periodic table want 8 valence electrons EXCEPT:

• Hydrogen

• Helium

• Krypton

• Hydrogen and Helium

Instead of 8 valence electrons in their valence shell, hydrogen and helium want how many?

• 6

• 4

• 2

• 7

What do the dots in an electron dot diagram represent?

• Protons

• Valence Electrons

• Neutrons

• How many atoms an element has

True or False: all elements that are NOT noble gases are more stable in a compound.

• True

• False

Tags

NGSS.MS-PS1-1

A ________________ is the force that holds atoms together in a compound.

• Chemical Bond

• Chemical Formula

• Valence Pull

• Electron Exchange

What is an ion?

• A neutral element

• An element that has lost or gained electrons

• An element that is negatively or positively charged

• All are true except for the first answer choice

A positive ion indicates that the atom __________ electrons.

• Gained

• Lost

• It didn't lose or gain any