Ch. 7a Review

Who developed a simplified model of the atom?

• Niels Bohr

• Dmitri Mendeleev

Tags

NGSS.MS-PS1-1

The number of protons plus neutrons is the atom's approximate atomic ______.

Abbreviations for the names of elements are chemical ______.

Match each term to its correct description.

• proton

• has a negative charge; travels around the nucleus

• neutron

• has a positive charge; locted in the nucleus

• electron

• has no charge; located in the nucleus

• nucleus

• the smallest piece of an element that can be recognized as that element

• atom

• the center part of an atom

Tags

NGSS.MS-PS1-1

Dmitri Mendeleev developed the periodic table of the elements, which ____ elements.

• weighs

• alphabetizes

• measures

• classifies

A column on the periodic table is called a ____.

• group

• period

• element

• number

A row on the periodic table is called a ____.

• group

• period

• element

• number

What is a substance that contains only one kind of atom?

• element

• mass

• shell

• nucleus