Chapter 4

Front

Who is credited with the formation of the 'plum pudding' model?

Back

Thomson

Front

What is the mass number of an atom with 3 protons and 4 neutrons?

Back

7

Front

Who used the word 'atomos' to describe the indivisible atom?

Back

Democritus

Front

What did Rutherford's experiments reveal about the atom?

Back

The nucleus

Front

What is the charge of a neutral atom?

Back

0, neutral

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the difference between mass number and atomic number?

Back

Mass number is the total number of protons and neutrons, while atomic number is the number of protons.

Front

What particle is positively charged in an atom?

Back

Proton

Front

What particle is negatively charged in an atom?

Back

Electron

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of the atom and stabilize the nucleus.