Principles of Science-The Atom

Question 1

Which model of the atom did Thomson propose?

Accepted Answer

plum pudding model

Question 2

How many protons are in an atom of Carbon?

Accepted Answer

6

Question 3

The principles of atomic theory recognized today were conceived by?

Accepted Answer

Dalton

Question 4

What parts of the atom make up most of the mass?

Accepted Answer

protons and neutrons

Question 5

An element can be identified by the number of ____________in the nucleus of its atoms

Accepted Answer

protons

Question 6

Whose series of experiments identified the nucleus of the atom?

Accepted Answer

Rutherford

Question 7

Which of the following statements is true according to modern atomic theory?

Accepted Answer

Atoms of the same element have different masses

Question 8

How many electrons does a neutral carbon atom have?

Accepted Answer

6

Question 9

All atoms of the same element have the same number of:

Accepted Answer

atomic number

Question 10

Most of the atom is empty space

Accepted Answer

True

Question 11

The total number of protons and neutrons in the nucleus of an atom is its

Accepted Answer

mass number

Question 12

Changing the number of electrons in an atom changes its...

Accepted Answer

charge.

Question 13

Which particle has the smallest mass?

Accepted Answer

electron

Question 14

Changing the number of neutrons in an atom changes its...

Accepted Answer

mass (weight)

Question 15

If the nucleus is the size of a marble How big would the atom be?

Accepted Answer

a stadium

Question 16

Rutherfords experiments let him to conclude that atoms contain massive central regions that

Accepted Answer

have a positive charge

Question 17

Diagram: Which is an electron

Accepted Answer

A

Question 18

Diagram: which is a neutron?

Accepted Answer

C

Question 19

When there are the same number of protons and electrons in an atom, that atom is a...

Accepted Answer

neutral atom.

Question 20

Phosphorus-33 (atomic number 15) contains:

Accepted Answer

18 neutrons

Question 21

Protons in the nucleus are attracted to each other by:

Accepted Answer

nuclear force

Question 22

The nucleus of an atom has all of the follwoing characteristics except that it

Accepted Answer

contains all the atoms volume

Question 23

Most particles fired at metal foil passed straight through, Rutherford concluded that:

Accepted Answer

atoms were mostly empty space

Question 24

What is the atomic number of an element with 12 protons, 13 neutrons, 12 electrons?

Accepted Answer

12

Question 25

The only letter not used in the periodic table is:

Accepted Answer

J

Question 26

How do we know atoms have different energy levels?

Accepted Answer

produce different color flames

Question 27

Most of the mass of an atom is found:

Accepted Answer

in the nucleus

Question 28

Isotopes are atoms of the same element that have different

Accepted Answer

masses

Question 29

Most of the volume of an atom is occupied by the:

Accepted Answer

electrons

Question 30

What is the atomic number?

Accepted Answer

The number of protons in an element

Question 31

Diagram: Which are protons?

Accepted Answer

B.

Question 32

Electrons have a ____________ charge

Accepted Answer

negative

Question 33

In determining the atomic mass of elements, the standard is the:

Accepted Answer

carbon-12 atom

Question 34

What is the ratio of oxygen to hydrogen when 36g of oxygen combines with 12g of carbon?

Accepted Answer

3:1

Question 35

Which of the following is not part of Dalton's atomic theory?

Accepted Answer

The number of protons is the atomic number

Question 36

The average atomic mass of an element is the average of the atomic masses of its:

Accepted Answer

naturally occuring isotopes

Principles of Science-The Atom

Questions 36

Principles of Science-The Atom

Questions 36