05 The Atom

In Rutherford’s experiment, he found that atoms were made of a dense, positive nucleus and surrounded by a cloud of electrons, but most of the atom is _______________.

• empty space

• a solid mass

• indivisible

• unknown

A Bohr model, is a planetary atomic model where electrons orbit the positive nucleus. Which image represents a Bohr model?

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• 
• 
• 

Which of the following is NOT a chemical symbol for an element?

• Co

• Ti

• CO

• V

The nucleus of an atom is where most of the __________ is found.

• mass

• volume

• length

• area

Electrons have a very small mass but carry a __________ charge.

• positive

• negative

• neutral

• unknown

The following Bohr Model represents which atom?

• hydrogen

• helium

• lithium

• beryllium

What is the atomic number of (¹⁷₈O)

• 17

• 8

• 9

• 25

What is the mass number of (¹⁵₇N)

• 15

• 7

• 8

• 22

How many electrons are in (³₂He)

• 3

• 2

• 1

• 5

How many neutrons are in (¹³₆C)

• 13

• 6

• 7

• 19