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Structure of Atom -1

Total questions: 23

Worksheet time: 22mins

Name
Class
Date
1.
A neutron has a charge of
a)
+2
b)
No charge
c)
-1
d)
+1
2.
A proton is....
a)
A negatively charged subatomic particle
b)
A positively charged subatomic particle
c)
A neutrally charged subatomic particle
d)
The only subatomic particle located in the nucleus
3.
An element's identity is determined by the number of
a)
electrons.
b)
protons.
c)
neutrons.
d)
valence.
4.

Subatomic particles with a negative charge

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

5.

. 

Subatomic particles that are neutral in charge

a)

Nucleus 

b)

Electrons

c)

Protons

d)

Neutrons

6.

All matter is made of 

a)

energy 

b)

atoms 

c)

air

d)

chemistry

7.
Where are the Electrons found in the structure of an atom?
a)
In the nucleus
b)
In spaces around the nucleus
8.
The subatomic particles in green are...
a)
Protons
b)
Neutrons
c)
Electrons
9.
In this picture, the Electrons are found in which color?
a)
Blue
b)
Red
c)
Green
10.

Neutrons have almost exactly the same mass as

a)

electrons.

b)

positrons.

c)

protons.

d)

quarks.

11.

What is atomic number?

a)

number of neutrons

b)

number of neutrons and protons

c)

number of protons

d)

number of electrons

12.

What is the atomic number of this atom?

a)

4

b)

5

c)

8

d)

9

13.

What is mass number?

a)

number of protons

b)

number of electrons

c)

number of protons and electrons

d)

number of protons and neutrons

14.

How many electrons are in an atom with an atomic number of 50?

a)

5

b)

8

c)

50

d)

2

15.
which atom has  4 neutrons?
a)
Li-6
b)
Li-7
c)
Li-8
d)
they have the same # of neutrons
16.

An atom of silicon has 14 protons and 15 neutrons. What is the mass number of this atom of silicon?

a)

14

b)

15

c)

29

d)

28.085

17.

What does the number Z represent?

a)

Mass number

b)

Atomic number

18.

What is atomic number?

a)

Number of protons and electrons

b)

Number of protons

c)

Number of neutrons

d)

Number of electrons

19.

Calculate the number of neutrons in the atom of Lithium. [tap the image]

a)

3

b)

4

c)

7

d)

2

20.

Is an atom has 7 electrons and 7 neutrons , then its atomic number and mass number will be ________ and _____ respectively

a)

7, 7

b)

7, 14

c)

7, 6

d)

14, 7

21.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
22.

An element with 4.35% have a mass of 49.9461 amu, 83.79% have amass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389amu.Find average atomic mass.

a)
51.99 amu
b)
52.19 amu
c)
53.45 amu
d)
17.33 amu
23.

If X is the symbol for an element, which of the following two symbols represent isotopes of the same element?  

I. 7735X  II. 7733X  III. 8137X  IV. 8135 X

a)

I and II

b)

III and IV

c)

I and IV

d)

I and III

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