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Atoms and Counting Atoms and Elements Assessment

Total questions: 45

Worksheet time: 36mins

Name
Class
Date
1.
All matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
2.

In an atom, what type of particle is neutral and has no charge?

a)

negatrons 

b)

electrons 

c)

neutrons 

d)

protons 

3.

In a chemical formula, what does the subscript number next to an element symbol represent?

a)

the number of electrons

b)

the number of neutrons

c)

the number of atoms of that element

d)

the number of nuclei

4.
True or False? Neutrons have a negative charge
a)
True
b)
False
5.

Calculate the number of atoms in the chemical formula H2O.

a)

1 hydrogen, 1 oxygen

b)

2 hydrogen, 1 oxygen

c)

2 hydrogen, 2 oxygen

d)

1 hydrogen, 2 oxygen

6.

How many electrons are found in the electron cloud of an atom?

a)

None

b)

All electrons

c)

Some are in the nucleus and some in the electron cloud.

d)

They are moving everywhere.

7.
In the modern periodic table elements are arranged by:
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
8.

How many atoms are represented in the chemical formula C6H12O6?

a)

6

b)

12

c)

24

d)

18

9.

How many atoms are there in one molecule of BeCl2?

a)

3

b)

4

c)

2

d)

1

10.

Consider a molecule composed of 8 oxygen atoms. How many protons are there in total?

a)

64

b)

8

c)

16

d)

32

11.

Consider a chemical formula containing 9 molecules of F2. How many Fluorine atoms are present in the sample?

a)

9

b)

10

c)

18

d)

28

12.

In a chemical formula containing boron atoms, each with an atomic number of 5 and a mass number of 11, how many neutrons are present in each atom?

a)

5

b)

6

c)

11

d)

16

13.

In a chemical formula containing neon atoms, each with an atomic number of 10 and a mass number of 20, how many neutrons are present in each atom?

a)

10

b)

18

c)

20

d)

30

14.

How many electrons are typically found in the electron cloud of a neutral atom?

a)

Equal to the number of neutrons

b)

Equal to the number of protons

c)

Equal to the atomic mass

d)

Equal to the number of electrons

15.

How many electrons are needed to balance the charge of a single proton?

a)

Variable

b)

Neutral

c)

One

d)

Two

16.

How many total subatomic particles are present in an atom with 6 protons and 8 neutrons?

a)

2

b)

6

c)

14

d)

20

17.
These particles orbit around the nucleus of an atom.  What are they called?
a)
electrons
b)
protons
c)
neutrons
d)
photons
18.
If you want to know which atom an element is, then count the _____
a)
protons
b)
neutrons
c)
electrons
d)
nucleons
19.
The positively charged particles of an atom are the ________.
a)
electrons
b)
protons
c)
neutrons
d)
protons & neutrons
20.
What does the nucleus of an atom contain?
a)
Electrons and neutrons
b)
Protons and neutrons
c)
Neutrinos and positrons
d)
DNA and RN
21.

Atoms are made up of ________________

a)

energy

b)

electrons

c)

subatomic particles

d)

gasses

22.

How many protons are in Sodium (Na)?

a)

22.99

b)

19

c)

11

d)

3

23.

How many atoms of Carbon are in this formula? C6 H12O6C_{6\ }H_{12}O_6  

a)

6

b)

1

c)

12

24.

How many elements are in this chemical formula?

H2SO4H_2SO_4  

a)

1

b)

2

c)

3

d)

4

25.

Which chemical formula correctly displays 1 atom of nickel and 2 atoms of Fluorine?

a)

niF2

b)

NIF2

c)

Ni1F2

d)

NiF2

26.

What is the total number of atoms in this chemical formula? C8H3NaBr12C_8H_3NaBr_{12}  

a)

18

b)

12

c)

25

d)

24

27.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
28.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
29.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
30.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
31.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
32.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
33.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
34.
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
a)
element symbol; atoms
b)
atom; element symbol
c)
subscript; protons
d)
compound; elements
35.

A ______ is a number written in front of a chemical formula.

a)

Coefficient

b)

Subscript

c)

Exponent

d)

Coordinator

36.

Chemists use letters of the alphabet as __________ for the elements.

a)

numbers

b)

symbols

c)

pictures

d)

none of the above

37.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
38.

Molecules that are made of more than one type of atom are called?

a)

Molecules

b)

Elements

c)

Mixtures

d)

Compounds

39.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
40.

How many neutrons do Scandium atoms have on average?

a)

27

b)

21

c)

45

d)

24

41.

Which element is this?

a)

Nickel

b)

Neon

c)

Sodium

d)

Nitrogen

42.

Name this element.

a)

Neon

b)

Magnesium

c)

Sodium

d)

Manganese

43.

In science class, your group is discussing how to find the number of neutrons. One of your group members says, "The number of neutrons is always the same number as the protons." Is this statement correct? If so, just say it is correct. If not, give an example with an element, where this is not true.

4 lines
44.

How many elements are in 2 C6H12O7? (a)  

How many C: ​ (b)  

How many H: ​ (c)  

How many O: ​ (d)  

How many TOTAL atoms: ​ (e)  

Choose from the below words
3
12
24
14
50
7
6
25
52
60
45.

The mass number of Atom A is ​ (a)   because there are ​ 6 positive ​ (b)   and 6 neutral ​ (c)   in the nucleus. Since the atomic number of Atom A is ​ (d)   then Atom A can be identified as ​ (e)   .

Choose from the below words
12
protons
neutrons
6
carbon
magnesium
electrons
18

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