Atoms: The Building Blocks of Matter

Question 1

The first atomic theory was proposed by ________.

Accepted Answer

Dalton

Question 2

How many neutrons are in this isotope of Magnesium?

Accepted Answer

13

Question 3

The first person to say that the atom is the smallest unit of matter

Accepted Answer

Democritus

Question 4

The sum of the protons and neutrons in the nucleus of the atom is called the

Accepted Answer

mass number

Question 5

If the atomic number is 4 and the mass number is 9, how many neutrons in the atom?

Accepted Answer

5

Question 6

In this model of an atom, the red circles are

Accepted Answer

protons

Question 7

The atomic number of magnesium is 12. Its nucleus must contain

Accepted Answer

12 protons

Question 8

The number of electrons in a stable atom equals the number of

Accepted Answer

protons

Question 9

In this model of an atom, the green dots are

Accepted Answer

neutrons

Question 10

The vertical colums of the periodic table.

Accepted Answer

groups

Question 11

The number of protons in the nucleus of an atom is called the

Accepted Answer

atomic number

Question 12

used the cathode ray tube to discover electrons

Accepted Answer

jj thompson

Question 13

Average Atomic Mass

Accepted Answer

average mass of an element&#x27;s isoptopes, according to abundence of isoptope

Question 14

The Law of Conservation of Mass states:

Accepted Answer

Matter cannot be created and it cannot be destroyed.

Question 15

A carbon atom has a mass of 14, but it usually has a mass of 12 AMUs. Why did this happen?

Accepted Answer

It has 2 more neutrons

Question 16

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

Accepted Answer

Atoms contain subatomic particles.

Question 17

Who did the Gold Foil Experiment?

Accepted Answer

Ernest Rutherford

Question 18

Periodic table rows

Accepted Answer

periods

Question 19

Isotopes of an element have the same number of ____ and a different number of ____

Accepted Answer

protons; neutrons

Question 20

In this model of the atom, the yellow dots are

Accepted Answer

electrons

Question 21

What is this an atom of?

Accepted Answer

helium

Question 22

The gold foil experiment showed

Accepted Answer

have a dense positive nucleus surrounded by space.

Question 23

The nucleus of the atom contains

Accepted Answer

protons and neutrons

Question 24

Rutherford&#x27;s experiments showed that

Accepted Answer

ALL of these!

Question 25

The positively charged part of the atom is known as the

Accepted Answer

proton

Question 26

The nucleus of the atom was first discovered by

Accepted Answer

Rutherford

Question 27

The negatively charged particle (electron) was discovered by

Accepted Answer

J. J. Thomson

Question 28

According to J.J. Thomson&#x27;s model of the atom...

Accepted Answer

atoms are made of negatively charged particles in "pudding"

Atoms: The Building Blocks of Matter

Questions 28

Atoms: The Building Blocks of Matter

Questions 28