Atoms

Name: ______________________   Date: ____________

Write the missing letters on the lines to finish each word.

1.
e c n
An elementary particle with negative charge (plural)
2.
t n
An elementary particle with 0 charge and mass about equal to a proton (plural)
3.
r n
A stable particle with positive charge equal to the negative charge of an electron (plural)
4.
c l
Center of an atom or a cell
5.
m i c m
The order of an element in Mendeleyev's table of the elements
6.
o i c
7.
n
A particle that is electrically charged (plural)
8.
s o
One of two or more atoms with the same atomic number but with different numbers of neutrons (plural)
9.
u t e
A unit strength of a radioactive source equal to one million disintegrations per second
10.
N e r
The sum of the ___ of neutrons and protons in an atomic nucleus
11.
T s
United States classical archaeologist noted for leading the excavation of the Athenian agora
12.
l t
English chemist and physicist who formulated atomic theory and the law of partial pressures
13.
t e
That which has mass and occupies space
14.
t i h e
15.
s
The smallest component of an element having the chemical properties of the element (plural)