Structure of Atom Test

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Structure of Atom Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

What tool was Thomson using when he discovered the electron?

A
Magnifying Glass

B
Hammer

C
Cathode Ray

D
Microscope
Question 2
1 / -0

Define the atomic mass unit.

A
Mass unit equal to exactly one-twelfth the mass of a carbon-12 atom

B
Mass unit equal to exactly the mass of a carbon-12 atom

C
Mass unit equal to exactly one-twelfth the mass of a hydrogen atom

D
All of the above

Solution

Atomic mass unit is a mass unit equal to exactly one-twelfth the mass of a carbon-12 atom.
Question 3
1 / -0

The difference between the mass number and the atomic number gives the _______.

A
number of neutrons

B
number of electrons

C
charge of an element

D
number of protons

Solution

The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The atomic number (Z) which denotes the number of protons in a nucleus. Hence, the difference between the mass number and the atomic number gives the number of neutrons (N) in a given nucleus $$ N = A - Z$$.
Question 4
1 / -0

Bohr modified the ___________ by adding that the electrons move in orbits of fixed size and energy.

A
Rutherford's model

B
Dalton's model

C
Thomson's model

D
Goldstein's model

Solution

Bohr modified the Rutherford model by adding that the electrons move in orbits of fixed size and energy. Electrons revolve around the nucleus in concentric circular orbits at fixed distance from the nucleus.
These are stationary orbits and the energy of electrons in these orbits is constant.
Question 5
1 / -0

The atomic number of an element is $$32$$ and mass number $$55$$. Calculate the number of neutrons?

A
$$23$$

B
$$32$$

C
$$21$$

D
$$25$$

Solution

Atomic number or number of protons$$=32$$
Mass number$$=55$$
Mass number$$(A)=Number\ of\ protons+ Number\ of\ neutrons$$
$$55=32+Number\ of\ neutrons$$
Number of neutrons$$=55-32$$
Number of neutrons$$=23$$
Question 6
1 / -0

Thomson showed that the stream of particles in cathode ray tube is made up of small particles which are a component of the atom and is:

A
neutral

B
negatively charged

C
positively charged

D
both A and B

Solution

Thomson discovered electrons using the cathode ray tube. It has been previously seen that if a electric current is passed through a vacuum tube, a glowing stream is formed. Thomson found that the mysterious glowing stream would bend toward a positively charged electric plate. He concluded that the stream is negatively charged. He also concluded based on his experiments that the negative stream has negatively charged particles that he called corpuscles (later renamed electrons).
Question 7
1 / -0

The atomic number is identical to the amount of ______ in the atom nucleus.

A
Protons

B
Neutrons

C
Both a and b

D
None of above

Solution

The element number is identical to the amount of protons in the atom nucleus. The amount of neutrons of an element varies, two atoms with the same amount of protons and neutrons are of the same isotope.
Question 8
1 / -0

Atomic number of an atom is equal to the __________.

A
number of protons

B
number of electrons

C
both a and b

D
sum of proton and electron

Solution

Atomic number (Z) is the number of protons in an atom. It is also equal to the number of electrons in the atom.
Atomic number $$=$$ number of protons
Example: the atomic number of an element is 12, then, its atom contains 12 protons and 12 electrons.
Question 9
1 / -0

Relative molecular mass is the ratio of __________.

A
the average mass of one molecule of an element or compound to of the mass of an atom of carbon-12

B
the average mass of one molecule of an element or compound to one twelfth of the mass of an atom of carbon-12

C
the average mass of one molecule of an element or compound to one fifth of the mass of an atom of carbon-12

D
the average mass of one molecule of an element or compound to one twelfth of the mass of an atom of carbon-16

Solution

Relative molecular mass is the ratio of the average mass of one molecule of an element or compound to one-twelfth of the mass of an atom of carbon-12.
Question 10
1 / -0

Atomic number of nitrogen is 7 . The number of protons in Nitrogen atom is equal to ________.

A
14

B
7

C
21

D
15

Solution

Since, atomic number $$ =$$ Number of protons$$ = $$Number of electrons
Therefore, number of electrons in nitrogen $$= 7$$
Number of protons in nitrogen$$ = 7$$

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Structure of Atom Test - 21

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Structure of Atom Test - 21

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SHARING IS CARING

Question 1

Magnifying Glass

Hammer

Cathode Ray

Microscope

Question 2

Mass unit equal to exactly one-twelfth the mass of a carbon-12 atom

Mass unit equal to exactly the mass of a carbon-12 atom

Mass unit equal to exactly one-twelfth the mass of a hydrogen atom

All of the above

Solution

Question 3

number of neutrons

number of electrons

charge of an element

number of protons

Solution

Question 4

Rutherford's model

Dalton's model

Thomson's model

Goldstein's model

Solution

Question 5

$$23$$

$$32$$

$$21$$

$$25$$

Solution

Question 6

neutral

negatively charged

positively charged

both A and B

Solution

Question 7

Protons

Neutrons

Both a and b

None of above

Solution

Question 8

number of protons

number of electrons

both a and b

sum of proton and electron

Solution

Question 9

the average mass of one molecule of an element or compound to of the mass of an atom of carbon-12

the average mass of one molecule of an element or compound to one twelfth of the mass of an atom of carbon-12

the average mass of one molecule of an element or compound to one fifth of the mass of an atom of carbon-12

the average mass of one molecule of an element or compound to one twelfth of the mass of an atom of carbon-16

Solution

Question 10

14

7

21

15

Solution

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