Size of Atom

Q. The atomic radius increases as we move down a group because:

1. atomic mass decreases
2. atomic number decreases
3. atomic number increases
4. number of shell increases

Q.

Question 36
Arrange the following elements in increasing order of their atomic radii.

(a) Li, Be, F, N
(b) Cl, At, Br, I

Q.

Atomic radius ___ , moving from left to right across a period.

Q.

The following diagram showing part of the periodic table in which atomic radii of elements of third period are given. Which of the following elements has the lowest atomic radii?

1. Cl

2. Na

3. P

4. Mg

Q.

Assertion: The atomic radius decreases as we move from left to right in a period.

Reason: Effective nuclear charge increases across the period from left to right.

1. Both assertion and reason are true but the reason is not the correct explanation for the assertion.

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2. Both assertion and reason are true and the reason is the correct explanation for the assertion.

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3. The assertion is true but the reason is false.

4. The assertion is false but the reason is true.

Q.

Why with travelling from left to right in a period atomic size decreases but suddenly increases in group 18

Q.

Which of the following has the maximum atomic radius?

1. Al

2. Si

3. P

4. Mg

Q.

Which of the following has the maximum atomic radius?

1. P

2. Mg

3. Al

4. Si

Q.

Among the given option which one has an ascending order of increasing atomic size.

1. Na < Al < Mg < S < Cl

2. Cl < S < Mg < Al < Na

3. Na < Mg < Al < S < Cl

4. Cl < S < Al < Mg < Na

Q.

The Van der Waals radii of $O,N,Cl,F$ and $Ne$ increases in the order?

1. $F,O,Ne,N,Cl$

2. $N,F,O,Ne,Cl$

3. $N,O,F,Ne,Cl$

4. $F,Cl,O,N,Ne$

Q. Atomic size refers to the radius of an atom. It is the distance from the centre of the atom to the outermost orbit. Arrange the elements Li, Na, K according to their atomic sizes.

1. K > Na < Li
2. Li > Na > K
3. Li < Na > K
4. K > Na > Li

Q. The nuclide ${}_8^{17}O$ has $8$ neutrons in its nucleus.

1. True
2. False

Q. Which of the following is the correct order of the atomic size of C, N, P and S?

1. $\text{N < C < S < P}$
2. $\text{N < C < P < S}$
3. $\text{C < N < S < P}$
4. $\text{C < N < P < S}$

Q.

An atom of which of the following elements has the smallest volume?

1. Nitrogen

2. Oxygen

3. Boron

4. Carbon

Q.

Atomic radii of fluorine and neon in angstrom units are respectively given by?

1. 0.762, 1.60

2. 1.60, 1.60

3. 0.72, 0.72

4. None of these values

Q.

Atomic radii of fluorine and neon in Angstrom units are respectively given by

1. 0.72, 1.60

2. 1.60, 1.60

3. 0.72, 0.72

4. None of these

Q. The atomic radius decreases as we move across a period because:

1. atomic mass increases.
2. more electrons are added.
3. atomic number increases.
4. effective nuclear charge increases.

Q. Assertion :The activity of 1 g pure uranium-235 will be greater than the same amount present as $U_3{O}_8$. Reason: In the combined state, the activity of the radioactive element decreases.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect