Trend in Atomic Radius

Q. What is the atomic mass of the first 30 elements of periodic table

Q. Why Atomic size decreases as we go from left to right in Modern Periodic Table?

Q. ntA nuclei of mass 220 amu in free state decays to emit an alpha particle.Kinetic energy of the alpha particle emitted is 5.4 MeV.The recoil energy of the daughter nucleus isn

Q.

Write the main points of Daltons atomic theory.

Q. Across a period, the nuclear charge and the atomic radii , so the ionisation energy increases across a period.

1. increases
2. decreases
3. remains same
4. $\mathrm{increases}\mathrm{then}\mathrm{decreases}$

Q.

Which element has the largest atomic size in the second period?

1. Li

2. Be

3. N

4. F

Q.

The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is:

1. Mg < K < Na < Rb

2. Mg < Na < K < Rb

3. Mg < Na < Rb < K

4. Na < K < Rb < Mg

Q.

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?

1. S< Se < Ca < Ba < Ar

2. Ca < S < Ba < Se < Ar

3. Ba < Ca < Se < S < Ar

4. Ca < Ba < S < Se < Ar

Q.

Question:

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

Chemistry Periodic Properties and Variations of Properties - Physical and Chemical Size of the Atom or Ion

Close

Solution:

Van der Waals radius decreases along a period from left to right due to increase in nuclear charge and then increases at noble gasses.

Chlorine being the element from the third period and rest from the second period has the largest size.

My question is if the radii at noble gases increases then in the ascending order how is neon placed before fluorine ? Plz explain. Thank you.

Q.

The atomic numbers of 4 elements A, B, C and D are 8, 9, 10 and 11 respectively. The order of their atomic volume is

1. A > B > C < D

2. A < B < C > D

3. A > B < C < D

4. A < B > C > D

Q.

Elements have been arranged in the following sequence on the basis of their increasing atomic masses.

F, Na, Mg, Al, Si, P, S, Cl, Ar, K.

(a) Pick two sets of elements which have similar properties.

(b) The given sequence represents which law of classification of elements?

Q.

Why are there 14 Lanthanides and Actinides?

Q.

State the periodic law as proposed by Mendeleev.

Q. What were the limitations of Dobereiner's classification?

Q. 'In a group, the atomic radii increase with increasing period number', explain this statement and justify it with reference to group 17.

Q.

What is the correct sequence in which the following law was given?

1. Newland's law of octaves

2. Law of triads.

3. Modern periodic table.

4. Mendeleev's periodic table.

1. 1-2-3-4

2. 3-2-1-4

3. 2-1-4-3

4. 3-2-4-1

Q.

The correct order of atomic size of $C,N,P,S$ is

1. 

2. 

3. 

4. 

Q.

‘Atomic number is the fundamental property of an element’. Write the name of the scientist who proposed it.

1. Bohr

2. Newlands

3. Mendeleev

4. Moseley

Q. Among the element of the second period Li to ne pick out the element:
(i) with the highest first ionisation energy
(ii) with the highest electronegativity
(iii) with the largest atomic radius Give the area-son for your choice.

Q.

The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration? [NEET 2017]

1. Nitrogen family, $\left[Rn\right]5F^{14},6d^{10},7s^2,7p^6$

2. Carbon family, $\left[Rn\right]5F^{14},6d^{10},7s^2,7p^2$

3. Oxygen family, $\left[Rn\right]5F^{14},6d^{10},7s^2,7p^4$

4. Halogen family, $\left[Rn\right]5F^{14},6d^{10},7s^2,7p^5$

Q. Which of the following sequence contain atomic number of only representative elements?

1. $21,39,81,82$
2. $25,31,82,83$
3. $11,12,16,32$
4. $71,79,80,81$

Q.

What is Dobereiner’s law of triads? Explain with the help of one example of a Dobereiner’s triad.

Q. If a set has 2 elements then the difference between the subsets of its powers set and number of its subset is ??

Q. i) Name the first and last element of period 2.
ii) What happens to the atomic size of elements while moving down the group?
iii) Which of the element has the greatest reactivity among the halogens?
iv) What is the common feature of the electronic configuration of the elements in Group 17?

Q.

A section which was common in Newlands and Mendeleevs classification is shown below :

Li	Be	B	C	N	O
Na	Mg	Al	Si	P	S

(i) Comment whose classification was better and why?
(ii) Give the point of difference (atleast two) between these two system of classification.

Q.

In both I and VII group of the periodic table which of the following property increases with increase in atomic number?

1. Oxidising property

2. Atomic size

3. Highest valency state

4. Reactivity with water

Q. Choose the correct pair based on the group they belong to, in the modern periodic table.

1. B
2. 16
3. O
4. 17
5. 18
6. Ne
7. C
8. N
9. 15
10. 13
11. 14
12. F

Q. Which of the following is the correct order of ionisation energy?

1. $O^{2-}<F^{-}<N{a}^{+}<M{g}^{2+}$
2. $F^{-}<O^{2-}<N{a}^{+}<M{g}^{2+}$
3. $O^{2-}<N{a}^{+}<F^{-}<M{g}^{2+}$
4. $M{g}^{2+}<N{a}^{+}<F^{-}<O^{2-}$

Q. Modern periodic table based an order of ___________.

1. increasing atomic mass
2. increasing atomic number
3. decreasing atomic mass
4. increasing density of atims

Q.

Elements have been arranged in the following sequence on the basis of their increasing atomic masses.

F, Na, Mg, Al, Si, P, S, Cl, Ar, K.

(a) Pick two sets of elements which have similar properties.

(b) The given sequence represents which law of classification of elements?