Check Your Understanding
Direction: Do the following tasks.
PART 1. From the lessons presented, complete the following statements.
an
1. An atom is made of a
2. A molecule is a combination of two or more
combined.
3. The term atom came from the Greek word
4. The
number of protons in a neutral atom.
and a
that are chemically
meaning indivisible.
is the same as the number of electrons and the
5. To get the number of neutrons, the atomic number is subtracted from the

PART 2. Match the scientist to what they discovered. Write the letter of your
answer on the space before each number.
1. Democritus
2.james chadwick
3.ernest rutherford
4 Joseph john thomson

A. proton and nucleus
b. atom
c. neutron
D. electron​