Structure of Atom Test

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Structure of Atom Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Mass number is ___________.

A
the sum of the total number of protons and neutrons present in the nucleus of an atom.

B
the electrons present in the outermost shell of an atom.

C
an atom of each element having a definite combining capacity.

D
the total number of protons present in the nucleus of an atom.

Solution

The mass number is defined as the sum of the total number of protons and neutrons present in the nucleus of an atom.
Question 2
1 / -0

According to modern atomic theory atoms of argon and calcium have same atomic weight, these are known as :

A
Isobars

B
Isotopes

C
None of these

D
Both a and b

Solution

Atoms having same atomic weights are known as isobars.
Question 3
1 / -0

Which of the following is not true for $$\displaystyle _7N ^{ 14 }$$ ?

A
14 is the mass number

B
7 is the atomic number

C
N is the symbol for nitrogen

D
14 is the atomic number

Solution

The general notation of an element is: $$_Z X^A$$, where X is the symbol of the element, Z its atomic number and A is the mass number.
So, in $$_7 X^14$$, 14 is the mass number of nitrogen while 7 is the atomic number.
Question 4
1 / -0

Thomson's atomic model concluded that _____ is the constituent particle of all kinds of atoms.

A
electron

B
protron

C
neutron

D
none of these

Solution

Thomson experiments with cathode-ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons.
So, option A is correct.
Question 5
1 / -0

Protons and neutrons are also called __________.

A
nucleons

B
isotope

C
isobars

D
elements

Solution

Protons and neutrons are also called nucleons.
Question 6
1 / -0

Atomic number is denoted by ________.

A
A

B
X

C
Z

D
M

Solution

Atomic number is denoted by Z.
Question 7
1 / -0

The mass number is same as __________.

A
atomic mass number

B
molecular mass number

C
both a and b

D
None of the above

Solution

The mass number should also not be confused with the relative atomic mass (also called atomic weight) of an element, which is the ratio of the average atomic mass of the different isotopes of that element (weighted by abundance) to the unified atomic mass unit.
Question 8
1 / -0

Atomic mass number is same as _______.

A
atomic number

B
mass number

C
formula mass number

D
valency

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. This is not the same as the atomic number (Z) which denotes the number of protons in a nucleus, and thus uniquely identifies an element.
Question 9
1 / -0

Mass number is also called as __________.

A
weight

B
molecular weight

C
Both A and B

D
atomic mass number

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. It determines the atomic mass of atoms.
Question 10
1 / -0

A neutral atom has 13 electrons and 14 neutrons. Its mass number is ____________.

A
13

B
26

C
27

D
28

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Structure of Atom Test - 20

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Structure of Atom Test - 20

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Question 1

the sum of the total number of protons and neutrons present in the nucleus of an atom.

the electrons present in the outermost shell of an atom.

an atom of each element having a definite combining capacity.

the total number of protons present in the nucleus of an atom.

Solution

Question 2

Isobars

Isotopes

None of these

Both a and b

Solution

Question 3

14 is the mass number

7 is the atomic number

N is the symbol for nitrogen

14 is the atomic number

Solution

Question 4

electron

protron

neutron

none of these

Solution

Question 5

nucleons

isotope

isobars

elements

Solution

Question 6

A

X

Z

M

Solution

Question 7

atomic mass number

molecular mass number

both a and b

None of the above

Solution

Question 8

atomic number

mass number

formula mass number

valency

Solution

Question 9

weight

molecular weight

Both A and B

atomic mass number

Solution

Question 10

13

26

27

28

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