Structure of Atom Test

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Structure of Atom Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

Relative molecular mass of water is __________.

A
18

B
16

C
12

D
14

Solution

Relative molecular mass for water $$\left({H}_{2}O\right)$$
$$= 2 \times$$ relative atomic number for hydrogen $$+ 1 \times$$ relative atomic number for oxygen
$$= 2 \times 1 + 1 \times 16$$
$$= 18$$
So, relative molecular mass for water is 18.
Question 2
1 / -0

What is the atomic number of Krypton?

A
36

B
35

C
38

D
34

Solution

The atomic number is the number of protons in an atom of an element. An atom of Krypton has 36 protons in its nucleus.

Hence, Krypton's atomic number is 36.

Hence, the correct option is $$\text{A}$$
Question 3
1 / -0

Atomic mass unit is abbreviated as __________.

A
atm

B
ama

C
a.m.u

D
aum

Solution

Atomic mass unit is abbreviated as a.m.u.
Question 4
1 / -0

For an element, $$A= 34$$ and $$N= 19$$, What is the atomic number of the element?

A
$$34$$

B
$$19$$

C
$$53$$

D
$$15$$

Solution

A is the mass number and N is the number of neutrons.
$$A = Z + N$$
$$Z = A - N$$
$$Z = 34 - 19$$
$$Z = 15$$
Hence, the atomic number is $$15$$.
Question 5
1 / -0

Which of the following represents Thomson's atomic model?

A

B

C

D
None of the above

Solution

Option $$C$$ represents the plum pudding model given by Thomson. He proposed that electrons are embedded in the positively charged sphere just like plums embedded in the pudding.
Question 6
1 / -0

What is the name for the number of protons in an atom?

A
Atomic identity

B
Atomic mass

C
Atomic weight

D
Atomic number

Solution

Atomic number is the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
Question 7
1 / -0

The mass number of $$X$$ is 23 which contains 15 electrons. What is the atomic mass of $$X$$?

A
$$38$$ amu

B
$$23$$ amu

C
$$18$$ amu

D
None of above

Solution

Mass no.$$=$$ no. of protons + no. of neutrons
Atomic mass $$=$$ Mass number $$=$$ 23
Question 8
1 / -0

Which one among the following principal energy level has exactly four subshells?

A
$$1$$

B
$$2$$

C
$$3$$

D
$$4$$

E
$$5$$

Solution

The fourth principal energy level $$(n=4)$$ has exactly four subshells $$ 4s, 4p, 4d$$ and $$4f$$.
Question 9
1 / -0

What is the correct order in which the listed atomic models were advanced and accepted, earliest first?

A
Bohr, planetary, plum pudding

B
Planetary, Bohr, plum pudding

C
Plum pudding, Bohr, planetary

D
Plum pudding, planetary, Bohr

E
Planetary, plum pudding, Bohr

Solution

J.J. Thomson proposed plum pudding model in 1904. Ernest Rutherford introduced the planetary model of an atom in 1911 which was modified by Neils Bohr in 1913 as Bohr model of an atom.
Order in which the atomic models were advanced : Plum pudding, planetary, Bohr
Question 10
1 / -0

Which of the following is NOT a postulate of Bohr's model of the hydrogen atom?

A

Gases excited by a voltage emits a bright-light emission spectrum.

B

The position of an electron in the hydrogen atom is not defined.

C

Electron absorbs energy to make transition to a higher energy level.

D

Electron emits energy when it makes transition to a lower energy level.

E

The energy levels of the electron are quantized.

Solution

Bohr showed that the electron in the hydrogen atom could only be found in certain selected (quantized) orbits, and no others.

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Re-Attempt Weekly Quiz Competition

Structure of Atom Test - 22

Result

Structure of Atom Test - 22

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Rank

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SHARING IS CARING

Question 1

18

16

12

14

Solution

Question 2

36

35

38

34

Solution

Question 3

atm

ama

a.m.u

aum

Solution

Question 4

$$34$$

$$19$$

$$53$$

$$15$$

Solution

Question 5

None of the above

Solution

Question 6

Atomic identity

Atomic mass

Atomic weight

Atomic number

Solution

Question 7

$$38$$ amu

$$23$$ amu

$$18$$ amu

None of above

Solution

Question 8

$$1$$

$$2$$

$$3$$

$$4$$

$$5$$

Solution

Question 9

Bohr, planetary, plum pudding

Planetary, Bohr, plum pudding

Plum pudding, Bohr, planetary

Plum pudding, planetary, Bohr

Planetary, plum pudding, Bohr

Solution

Question 10

Gases excited by a voltage emits a bright-light emission spectrum.

The position of an electron in the hydrogen atom is not defined.

Electron absorbs energy to make transition to a higher energy level.

Electron emits energy when it makes transition to a lower energy level.

The energy levels of the electron are quantized.

Solution

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