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Atomic Structure & History

Total questions: 45

Worksheet time: 28mins

Name
Class
Date
1.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
2.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
3.
the central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
4.
an atom with atomic number 6 would have how many protons 
a)
6
b)
12
c)
3
d)
cannot be determined 
5.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
6.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
7.
A particle that moves around the nucleus is a(n)...
a)
Proton
b)
Neutron
c)
Electron
d)
Quark
8.

What does the 1.00794 stand for?

a)

mass number

b)

atomic number

c)

average atomic mass

d)

number of protons

9.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
10.

If an atom has 12 protons, which of the following must it also have to be considered a neutral atom?

a)

12 neutrons

b)

12 electrons

c)

12 protons

d)

24 protons and neutrons

11.
If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the mass of the atom?
a)
10
b)
20
c)
30
12.

What charge does an atom have when it GAINS electrons?

a)

Positive

b)

Negative

c)

Neutral

13.

What two particles determine the mass number?

a)

Protons and electrons

b)

Electrons and neutrons

c)

Protons and neutrons

14.

When an atom loses an electron, it becomes a(n) _____________ ion.

a)

positive

b)

negative

c)

neutral

d)

polyatomic

15.

If the mass number of this chlorine atom is 36, how many neutrons does it have?

a)

17

b)

18

c)

19

d)

can't be determined

16.

What is the atomic number of this atom shown in the Bohr model?

a)

11

b)

12

c)

13

d)

can't be determined

17.

What is the mass number of the atom shown in the Bohr model?

a)

11

b)

12

c)

23

d)

Can't be determined

18.

Is this atom an ion? If so what would it's charge be?

a)

Yes, 1-

b)

No it is neutral

c)

Yes, 1+

d)

Can't be determined

19.

Most of the mass of an atom is found in the ______.

a)

nucleus

b)

proton

c)

electron cloud

d)

isotope

20.
Two atoms of the same element but with different mass numbers are called________
a)
electrons
b)
isotopes
c)
variables
d)
electron cloud
21.

Whose model suggested that negative particles were mixed in with positively charged material - like seeds in a watermelon?

a)

J.J. Thomson

b)

Ernest Rutherford

c)

Niels Bohr

d)

Albert Einstein

22.

Who discovered that the atom had an small, dense, positively charged center?

a)

Ernest Rutherford

b)

J.J Thomson

c)

Robert Millikan

d)

John Dalton

23.

Place the following atomic models in order, from earliest to latest:


A) Rutherford B) Thomson C) Dalton

a)

B, C, A

b)

C, A, B

c)

A, C, B

d)

C, B, A

24.
What can you conclude from the fact that scientists continue to update the atomic model?
a)
New information about atoms continues to be discovered
b)
Old information about atoms is completely useless
c)
Scientists did not have any information about atoms until a few years ago
d)
Scientists still have no idea what atoms look like
25.

Who named the positive center of the atom the "nucleus?"

a)

Democritus

b)

Dalton

c)

Thomson

d)

Rutherford

26.

Which scientist discovered that the atom has parts - which means it can be divided?

a)

Democritus

b)

Dalton

c)

Thomson

d)

Rutherford

27.

Which scientist believed that elements differed from one another because their atoms had different mass?

a)

Democritus

b)

Dalton

c)

Thomson

d)

Rutherford

28.

In the atomic model nicknamed the "plum pudding" model, what do the plums represent?

a)

the nucleus

b)

the atom

c)

the electrons

d)

the positive material

29.

Which scientist proposed a new atomic model after discovering the electron in 1897?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

30.

Who discovered that atoms are mostly empty space?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

31.

Which scientist was the first to benefit from the Lavoisier's efforts to define pure substances in the 1700's?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

32.

Who proposed that electrons move around the nucleus in circular orbits?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

33.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
34.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
35.
How many neutrons does the isotope below have?     89 36Kr
a)
53
b)
36
c)
89
d)
125
36.

Isotopes of an element have a different number of...

a)

Protons

b)

Neutrons

c)

Electrons

d)

Mass

37.

What is a cation's charge?

a)

positive

b)

negative

c)

neutral

d)

depends on the element

38.

What is an anion's charge?

a)

positive

b)

negative

c)

neutral

d)

depends on the element's charge

39.

Is the ion ammonium a cation or an anion?

a)

cation

b)

anion

40.

Valence Electrons of Magnesium

a)

1

b)

2

c)

3

d)

4

41.

Valence Electrons of Argon

a)

5

b)

6

c)

7

d)

8

42.
How many valence electrons are found in atoms of group 15?
a)
4
b)
5
c)
2
d)
3
43.

How many valence electrons do elements in group 18 have (except helium)?

a)

18

b)

88

c)

8

d)

1

44.

What is this element?

a)

Beryllium (atomic #4)

b)

Boron (atomic #5)

c)

Carbon (atomic #6)

d)

Nitrogen (atomic #7)

45.

Name this element.

a)

Neon

b)

Magnesium

c)

Sodium

d)

Manganese

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