Structure of the Atoms Test

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Structure of the Atoms Test - 20

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Question 1
1 / -0

......... is defined as the number of protons present in the nucleus of an atom.

A
Atomic number

B
Mass number

C
Both A and B

D
None of these

Solution

Atomic number is defined as the number of protons present in the nucleus of an atom and it is denoted by $$Z$$.
For hydrogen, $$Z = 1$$, because in a hydrogen atom, only one proton is present in the nucleus. Similarly, for carbon, $$Z = 6$$
Question 2
1 / -0

Who discovered the positively charged particle called proton?

A
Chadwick

B
Goldstein

C
Rutherford

D
None of these

Solution

Ernest Rutherford postulated that an atom has a positively charged center (nucleus) that contains most of the atom's mass. He suggested that the nucleus contains positively charged particles (protons).
Question 3
1 / -0

Which of these have the same chemical properties, but their physical properties may be different?

A
Atomic number

B
Mass number

C
Isotopes

D
Isobars

Solution

Isotopes have same chemical properties, but their physical properties might be different.

Chemical properties of an element depend on its atomic number or number of protons. Isotopes of an element have the same atomic number, hence their chemical properties are the same. But their physical properties may vary.
Question 4
1 / -0

The charge on a neutron is:

A
$$-1.602\times10^{-19}C$$

B
$$1.602\times10^{-19}C$$

C
$$0$$

D
None of the above
Question 5
1 / -0

Neutron's relative charge is:

A
$$-1$$

B
$$+1$$

C
$$0$$

D
$$-2$$

Solution

Neutron is a neutral particle that means it has no charge. It was discovered by J.Chadwick in 1932.
Question 6
1 / -0

What tool was Thomson using when he discovered the electron?

A
Magnifying Glass

B
Hammer

C
Cathode Ray

D
Microscope
Question 7
1 / -0

The distribution of electron in $$Kr$$ is _________.

A
$$2(K),\;8(L),\;18(M),\;8(N)$$

B
$$2(K),\;1(L),\;18(M),\;8(N)$$

C
$$2(K),\;1(L),\;18(M),\;8(N)$$

D
$$2(M),\;1(L)$$

Solution

The atomic number of Kr is $$36$$ and the distribution of electrons in Kr is $$2(K),\;8(L), 18(M), 8(N)$$
Option $$A$$ is correct.
Question 8
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 9
1 / -0

Canal rays are:

A
anode rays

B
positive rays

C
both A and B

D
electron rays

Solution

Canal rays are also known as anode rays. They are positively charged radiations (simply called positive rays) that are in fact a beam of positive ions created by certain types of gas-discharge tubes.
Question 10
1 / -0

Neutron has no charge but mass equal to that of ________.

A
proton

B
electron

C
Both A and B

D
None of the above

Solution

Neutron has no charge but the mass is equal to that of the proton. It weighs 1 amu.

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Re-Attempt Weekly Quiz Competition

Structure of the Atoms Test - 20

Result

Structure of the Atoms Test - 20

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Question 1

Atomic number

Mass number

Both A and B

None of these

Solution

Question 2

Chadwick

Goldstein

Rutherford

None of these

Solution

Question 3

Atomic number

Mass number

Isotopes

Isobars

Solution

Question 4

$$-1.602\times10^{-19}C$$

$$1.602\times10^{-19}C$$

$$0$$

None of the above

Question 5

$$-1$$

$$+1$$

$$0$$

$$-2$$

Solution

Question 6

Magnifying Glass

Hammer

Cathode Ray

Microscope

Question 7

$$2(K),\;8(L),\;18(M),\;8(N)$$

$$2(K),\;1(L),\;18(M),\;8(N)$$

$$2(K),\;1(L),\;18(M),\;8(N)$$

$$2(M),\;1(L)$$

Solution

Question 8

electron

protron

neutron

none of these

Solution

Question 9

anode rays

positive rays

both A and B

electron rays

Solution

Question 10

proton

electron

Both A and B

None of the above

Solution

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