Structure of Atom Test

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Structure of Atom Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

Impossible orbital among the following is

A
$$3f$$

B
$$2p$$

C
$$4d$$

D
$$2s$$

Solution

If the value of principle quantum number is 3. So the maximum possible value of Azimuthal quantum number is (3-1)=2 which describes the d subshell. But for f subshell, the value of $$l$$ must be 3. So, 3f orbital is not possible at all.
Question 2
1 / -0

Two electrons occupying the same orbital are distinguished by:

A
Principle quantum Number

B
Magnetic quantum number

C
Azimuthal quantum number

D
Spin quantum number

Solution

According to the Pauli exclusion principle no two electrons can have the same set of all four quantum numbers simultaneously. Two electrons present in the same orbital can be distinguished by their spin quantum number. If one of them has a +1/2 value then other must have the -1/2 value.

So the correct option is D
Question 3
1 / -0

There are $$ 42$$ protons and $$53$$ neutrons in the atom of an element. This element is represented as:

A
$$\displaystyle _{42}X^{95}$$

B
$$\displaystyle _{42}X^{53}$$

C
$$\displaystyle _{53}X^{42}$$

D
$$\displaystyle _{95}X^{42}$$

Solution

Atom an element is represented as:

$$\displaystyle _{Atomic\ no}X^{Mass\ no}$$

where Atomic no = No of protons in atom = 42
Mass no = No of protons + No of neutrons = 42+53= 95

Hence, the correct answer is $$A$$.
Question 4
1 / -0

When $$Z$$ is doubled in an atom, which of the following statement is consistent with Bohr's theory?

A
Energy of a state is doubled

B
Radius of an orbit is doubled

C
Velocity of electrons in the orbit is doubled

D
Radius of an orbit is quadrupled.

Solution

Let the initial charge be $$z$$.
$$\dfrac{kz^2}{r^2}=\dfrac{m_ev^2}{r}$$

when $$z$$ is doubled,

$$\dfrac{k{(2 z)}^2}{r^2}=\dfrac{m_e(v_1)^2}{r}$$

$$v_1=2v$$
Question 5
1 / -0

An atom contains eleven protons. State its atomic number and the number of electrons it contains.

A
12, 12

B
12, 11

C
11, 11

D
12, 13

Solution

As we know, atomic no. of an atom is total no. of proton (p) present in nucleus of atom and every neutral atom has same no. of proton and electron. Mass no. of an atom is total no of neutron and proton (n+p) present in nucleus of atom. So, X has atomic no. 11 and it has 11 electrons.
Question 6
1 / -0

The number of electrons in a neutral atom is equal to:

A
atomic mass number

B
number of neutrons

C
its valency

D
number of protons

Solution

The no. of electrons in a neutral atom are equal to its number of protons. It is also equal to its atomic number.

For example, the atomic number of N is 7. It contains 7 electrons and 7 protons.

Therefore, the correct option is (D)
Question 7
1 / -0

What is the difference in number of neutrons in Protium and Deuterium?

A
1

B
2

C
3

D
4

Solution

Isotopes of an element differ in the number of neutrons in their nuclei.
They have the same number of protons and electrons. Hence the same atomic number but a different mass number.

Protium and Deuterium, $$_1^1H$$ and $$_1^2H$$, have the same atomic number and different mass number. They have 1 proton and 1 electron each. But they have 0 and 1 neutrons respectively.

So, the difference in the number of neutrons $$=1$$.
Question 8
1 / -0

According to whose atomic model, electrons are embedded in a gel of positive charge?

A
Dalton's model

B
Bohr's model

C
Thomson's model

D
Rutherford's model

Solution

Thomson assumed that an atom is a sphere of positive charges uniformly distributed, with the electrons scattered as points throughout the sphere. This was known as plum-pudding model at that time.
Question 9
1 / -0

An atom of an element has two electrons in the M shell. Identify its atomic number.

A
10

B
12

C
14

D
15

Solution

For M shell value of $$n= 3$$. Thus the electronic configuration is : 2, 8, 2 and atomic number is 12.
Question 10
1 / -0

Which statement about atom is incorrect?

A
Atoms are invisible

B
All atoms have same number of protons and electrons

C
Atoms are made up of subatomic particles

D
It has mass
Solution
Atoms are smallest particle of an element.
They consists of solid mass in the center known as the nucleus in which protons and neutrons are present.
Outside the nucleus, there are present electrons which keep up on revolving around it.
Thus the atom is not mostly the empty space.
Hence this statement is $$False$$.

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Structure of Atom Test - 31

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Structure of Atom Test - 31

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SHARING IS CARING

Question 1

$$3f$$

$$2p$$

$$4d$$

$$2s$$

Solution

Question 2

Principle quantum Number

Magnetic quantum number

Azimuthal quantum number

Spin quantum number

Solution

Question 3

$$\displaystyle _{42}X^{95}$$

$$\displaystyle _{42}X^{53}$$

$$\displaystyle _{53}X^{42}$$

$$\displaystyle _{95}X^{42}$$

Solution

Question 4

Energy of a state is doubled

Radius of an orbit is doubled

Velocity of electrons in the orbit is doubled

Radius of an orbit is quadrupled.

Solution

Question 5

12, 12

12, 11

11, 11

12, 13

Solution

Question 6

atomic mass number

number of neutrons

its valency

number of protons

Solution

Question 7

1

2

3

4

Solution

Question 8

Dalton's model

Bohr's model

Thomson's model

Rutherford's model

Solution

Question 9

10

12

14

15

Solution

Question 10

Atoms are invisible

All atoms have same number of protons and electrons

Atoms are made up of subatomic particles

It has mass

Solution

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