Chemistry Review

The modern periodic table is arranged in order of increasing atomic ____.

• mass

• charge

• number

• radius

Who arranged the elements according to atomic mass and used the arrangement to predict the properties of

missing elements?

• Henry Moseley

• Antoine Lavoisier

• John Dalton

• Dmitri Mendeleev

What element has the electron configuration 1s ² 2s² 2p ⁶ 3s² 3p ² ?

• Nitrogen

• Selenium

• Silicon

• Silver

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which is a typical characteristic of an ionic compound?

• Electron pairs are shared among atoms

• The ionic compound has a low solubility in water

• The ionic compound is described as a molecule

• The ionic compound has a high melting point

Which of these elements does not exist as a diatomic molecule?

• Ne

• F

• H

• I

According to VSEPR theory, molecules adjust their shapes to keep which of the following as far apart as

possible?

• pairs of valence electrons

• inner shell electrons

• inner shell electrons

• he electrons closest to the nuclei

In naming a binary molecular compound, the number of atoms of each element present in the molecule is

indicated by ____

• Roman numerals

• superscripts

• prefixes

• suffixes

Which of the following correctly shows a prefix used in naming binary molecular compounds with its

corresponding number?

• deca-, 7

• nona-, 9

• hexa-, 8

• octa-, 4

Which of the following formulas represents a molecular compound?

• ZnO

• Xe

• SO₂

• BeF₂

Tags

NGSS.MS-PS1-1

In any chemical compound, the elements are always combined in the same proportion by ____.

• charge

• mass

• volume

• density

Tags

NGSS.MS-PS1-5