Atomic Size

Q.

What is the modern periodic law?

Q.

The element with maximum atomic radius in the second period ______.

Q. The correct decreasing order of the atomic radii of the elements sodium, magnesium and aluminium is:

1. Magnesium > Sodium > Aluminium
2. Sodium > Magnesium > Aluminium
3. Magnesium > Aluminium > Sodium
4. Aluminium > Sodium > Magnesium

Q. is the distance from the centre of nucleus to the valence shell of an atom

1. Covalent radius
2. Metallic radius
3. Ionic radius
4. Atomic radius

Q.

The size of nucleus is of the order of ____ m.

Q.

What are the merits and limitations of the long form of periodic table?

Q.

Why does the ionization energy of elements increase from left to right in a period?

Q. On moving from left to right in a period of the modern periodic table, the atomic number of the elements increases. What happens to the size of elements generally on moving left to right in a period ?

1. Increases
2. Decreases
3. Remains the same
4. First increases then decreases

Q.

Which of the following properties generally increases on moving from top to bottom in a group?

1. Ionisation energy

2. Nonmetallic character

3. Atomic size

4. Valency

Q.

Arrange the following elements in decreasing order of atomic size.

Element: A → Atomic number is 7.

Element: B → Atomic number is 3.

Element: C → Atomic number is 9.

Element: D → Atomic number is 11.

1. CDBA

2. DBAC

3. ACBC

4. BDAC

Q. Which amongst the following elements has the largest atomic size?

1. Beryllium
2. Carbon
3. Oxygen
4. Fluorine

Q. __________ is the total attractive force exerted by protons present in the nucleus on electrons which are present in the outermost shell.

1. Nuclear charge
2. Screening effect
3. Effective nuclear charge
4. Electromagnetic force

Q.

What happens to the atomic size of elements moving from top to bottom of group?

Q.

The first ionization energy of the $\mathrm{d}$-block elements lie between ________ .

Q.

The atomic radii increase over a period from left to right.

1. True
2. False

Q. Arrange the following elements in the decreasing order of their atomic radius: carbon, lithium, sodium.

1. Lithium > Sodium > Carbon
2. Carbon > Lithium > Sodium
3. Sodium > Lithium > Carbon
4. Carbon > Sodium > Lithium

Q.

Which of the following elements will have the largest atomic radii?

1. $\mathrm{Cl}$

2. $\mathrm{Br}$

3. $\mathrm{K}$

4. $\mathrm{Na}$

Q. Which of the following elements has the largest atomic radius?

1. Aluminium
2. Silicon
3. Phosphorus
4. Magnesium

Q. Which of the following elements has the largest atomic size?

1. B
2. C
3. O
4. Al

Q.

Define Atomic radius

Q. Match the elements with the block they belong to in the modern periodic table.

1. s-block
2. p-block
3. d-block
4. f-block

Q. According to Moseley's periodic law the physical and chemical properties of elements are the periodic function of their atomic .

1. numbers
2. structures
3. masses

Q.

The radius of an atom or the atomic radius is measured in ------------

Q. The magnitude of shielding effect is dependent on_______.

1. number of innermost electrons
2. number of valence electrons
3. number of protons in nucleus
4. number of neutrons in nucleus

Q. The size of the anion is larger than its parent atom.

1. True
2. False

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

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

Q.

What is meant by atomic radius? How does it vary down the group and why? How does it vary along a period and why?

Q.

How does atomic atomic radius change as we move along the period?

Q.

Elements X, Y and Z belongs to IA group of the periodic table their atomic radii are as follows:

X⇢1.33 A, Y⇢0.95 A, Z⇢0.60 A

Arrange the elements in the increasing order of atomic numbers by giving reasons.

Q. Which among the given elements have higher atomic radius?

1. Fluorine
2. Neon
3. Helium