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Atoms, Elements and Compounds

Total questions: 50

Worksheet time: 2hrs 1mins

Name
Class
Date
1.

The atomic mass is the

a)

number of protons and neutrons inside the nucleus

b)

number or electrons or protons

c)

number of protons, neutrons and electrons

2.
What is at the center of every atom?
a)
An electron
b)
A compound
c)
A molecule
d)
A nucleus
3.
The positively charged particles of an atom are the ________.
a)
electrons
b)
protons
c)
neutrons
d)
protons & neutrons
4.
The particles with no charge in an atom are the _______.
a)
electrons
b)
neutrons
c)
protons
d)
protons and neutrons
5.
What does the nucleus of an atom contain?
a)
Electrons and neutrons
b)
Protons and neutrons
c)
Neutrinos and positrons
d)
DNA and RN
6.

Identifies the number of protons in an atoms nucleus.

a)

Electron Cloud

b)

Atomic Theory

c)

Atomic Number

d)

Mass Number

7.

The negatively charged particles in an atom

a)

Proton

b)

Electron

c)

Neutron

d)

Electron Cloud

8.

The region inside an atom where electrons are likely to be found

a)

Proton

b)

Atom

c)

Electron Cloud

d)

Neutron

9.
An atom is made up of protons, neutrons, and electrons.  Which is the smallest subatomic particle?
a)
Proton
b)
Neutron
c)
Electron
d)
Idontknowatron
10.
Which is an electron?
a)
A
b)
B
c)
C
11.

The mass number of an atom is the mass of ______ + _____

a)

protons + neutrons

b)

protons + electrons

c)

neutrons + nucleus

d)

protons + nucleus

12.

_____ have a smaller mass than protons and neutrons.

a)

isotopes

b)

electrons

c)

ions

d)

breons

13.

What is the ATOMIC NUMBER in this element tile?

a)

28

b)

Ni

c)

Nickel

d)

58.693

14.
How many protons are in this element?
a)
79
b)
196
c)
117
d)
Cannot be determined
15.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
16.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
17.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
18.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
19.
How many Chlorine are in MgCl2?
a)
2
b)
1
c)
3
20.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
21.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
22.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
23.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
24.
How many atoms of Hydrogen are in this compound
a)
1
b)
2
c)
3
d)
4
25.

The atomic number is always the number of

a)

protons

b)

neutrons

c)

electrons

26.

To find the number of neutrons....

a)

add the number of electrons and number of protons

b)

subtract the atomic number from the atomic mass

c)

subtract the number of protons from the number of electrons

27.

How many neutrons does an atom of Nitrogen have?

a)

7

b)

14

c)

21

28.

What part of the atom is the arrow pointing to?

a)

Proton

b)

Neutron

c)

Electron

29.

What part of the atom is the arrow pointing to?

a)

Proton

b)

Neutron

c)

Electron

30.

What part of the atom is the arrow pointing to?

a)

Proton

b)

Neutron

c)

Electron

31.

An element is determined by the number of ________ in its nucleus (also known as its atomic number).

a)

neutrons

b)

electrons

c)

protons

32.

How many protons does this element have?

a)

16

b)

8

c)

0

33.

Why is the overall charge of an atom neutral (0)?

a)

They have the same number of protons and neutrons.

b)

They have the same number of protons and electrons.

c)

They have the same number of electrons and neutrons.

34.

Using the diagram as a reference, how many electrons does lithium have in its OUTER shell?

a)

1

b)

3

c)

8

d)

2

35.

Using the diagram as a reference, how electrons does carbon have in its OUTER shell?

a)

2

b)

6

c)

4

d)

1

36.

In the modern periodic table, elements are arranged by:

a)

atomic mass

b)

atomic number

c)

valence electrons

d)

number of isotopes

37.

The large numbers before a chemical formula that are used as multipliers are known as __________________.

a)

element symbols

b)

exponents

c)

coefficients

d)

subscripts

38.

The small numbers under and to the right of element symbols in a formula are called _________________.

a)

element symbols

b)

exponents

c)

coefficients

d)

subscripts

39.

What is the correct "inventory" for KClO3

a)

K = 1 Cl = 3 O = 3

b)

K = 3 Cl = 3 O = 3

c)

K = 1 Cl = 1 O = 3

d)

K = 1 C = 1 l = 1 O = 3

40.

What is the coefficient in the formula?

a)

2

b)

N

c)

H

d)

3

41.

What is the subscript in the formula?

a)

2

b)

N

c)

H

d)

3

42.

What is the correct "inventory" for 3Al2O4

a)

Al = 6 O = 4

b)

Al = 6 O = 12

c)

Al = 2 O = 4

d)

Al = 3 O = 4

43.

Element or Compound?

H2O

a)

Element

b)

Compound

44.

Which of the following is a compound?

a)

Co

b)

O2

c)

C

d)

CO2

45.

How many nitrogen atoms are there?

a)

4

b)

8

c)

10

d)

20

46.

How many molecules of methane are there?

a)

0

b)

1

c)

2

d)

4

47.

How many different elements are used to make Salt (NaCl)

a)

1

b)

2

c)

3

d)

4

48.

How many different elements are used to make Calcium Carbonate (CaCO3)

a)

3

b)

4

c)

5

d)

6

49.

Which chemical formula below represents a molecule made up of 1 carbon atom and 2 oxygen atoms?

a)

CO

b)

C2O

c)

CO2

d)

C2O2

50.

Which of the following chemical formulas represents a molecule made of 1 potassium, 1 nitrogen, and 3 oxygen atoms?

a)

KNO3

b)

PNO3

c)

PNo3

d)

KNo3

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