PS M18 Test Review

Dot diagrams are used to represent ____.

• protons

• outer electrons

• atomic mass

• the structure of the nucleus

In the compound, H2O, the electrons in the bonds are unequally shared between oxygen and hydrogen, forming ____.

• cations

• ionic bonds

• nonpolar molecules

• polar bonds

Some elements are unlikely to lose or gain electrons, but share electrons to form covalent bonds. Which of the following elements is most likely to form covalent bonds?

• silicon (#14)

• oxygen (#8)

• chlorine (#17)

• sulfur (#16)

What is the neutral particle that is formed when atoms share electrons?

• cation

• ionic compound

• molecule

• nucleus

Tags

NGSS.MS-PS1-1

Which of the following bonds is polar?

• F--F

• O--H

• O--O

• H--H

What is the group number for elements that have a stable number of electrons in their outer energy level?

• 18

• 17

• 2

• 1

Which of the following compounds is not likely to have ionic bonds?

• LiF

• NaCl

• CH₄

• MgF₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following elements will likely form a negative ion in its ionic compounds?

• Li, lithium

• Al, aluminum

• Mg, magnesium

• Cl, chlorine

Aspartame is an artificial sweetener; its formula is C₁₃H₁₆N₂O₅. Which element in the formula has the largest number of atoms?

• carbon

• hydrogen

• nitrogen

• oxygen

Tags

NGSS.MS-PS1-1

A group of covalently bonded atoms that acts together as one charged atom is a ____.

• crystal

• molecule

• negative ion

• polyatomic ion