Periods

Q.

What are the seven groups of the periodic table?

Q.

Name the eight groups of the periodic table.

Q.

What are horizontal rows in the periodic table known as?

Q. The effective nuclear charge felt by the 4s electron in potassium atom is .

1. 2.65
2. 2.2
3. 2.45

Q.

How many $\pi$ - electrons are there in the following structure?

1. 2

2. 4

3. 6

4. 8

Q.

The electronic configuration of gadolinium (Atomic number 64) is
(a) $\left[Xe\right]4f^{3}5d^{5}6s^2$
(b) $\left[Xe\right]4f^{7}5d^{2}6s^1$
(c) $\left[Xe\right]4f^{7}5d^{1}6s^2$
(d) $\left[Xe\right]4f^{8}5d^{6}6s^2$

Q.

Why are transition elements called $d$-block elements? How does it build a bridge between $s$ and $p$ block elements?

Q. Why does aluminium have maximum covalency of 6 if it has 9 Orbitals in valence shell?

Q. The general outer electronic configuration of transition elements is exhibited by:

1. $n{s}^1$
2. $n{s}^{2}n{p}^5$
3. $n{s}^2(n-1)d^{1-10}$
4. $n{s}^2(n-1)d^{10}$

Q. Which of the following series in the periodic table contains only radioactive element?

1. 3d-series
2. 6d-series
3. Lanthanides
4. Actinoids

Q. What is the first element of the fourth transition series in the periodic table?

1. Scandium
2. Yttrium
3. Actinium
4. Lanthanum

Q.

The fourth and fifth periods have ________elements and are called _______period.

Q. Are all 118 elements discovered

Q.

(i) Comprehension given below is followed by some multiple choice questions. Each question has one correct option. Choose the correct option. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz s, p, d, and f.
The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (1 to 7 ) have 2, 8, 8, 18, 18, 32, and 32 elements respectively.
The seventh period is still incomplete. To avoid the periodic table being too long , the two series of f-block elements, called lanthanoids and actionoids are placed at the bottom of the main body of hte periodic table
The element with atomic number 57 belongs to
(a) s- block ( b) p-block (c) d- block (d) f- block

(ii) The last element of the p - block in 6th period is represented by the outermost electronic configuration.
(a) $7s^{2}7p^6$ (b) $5f^{14}6d^{10}7s^{2}7p^0$
(c) $4f^{14}5d^{10}6s^{2}6p^6$ (d) $4f^{14}5d^{10}6s^{2}6p^4$

(iii) Which of the elements whose atomic numbers are given below, cannot be accommodated in the present set up of the long frm of the periodic table?
(a) 107 (b) 118 (c) 126 (d) 102

(iv) The electronic configuration of the element which is just above the element with atomic number 43 in the same group is .....
(a) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^2$
(b) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^{3}4p^6$
(c) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{6}4s^2$
(d) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{7}4s^2$

(v) The elements with atomic numbers 35, 53 and 85 are all ..
(a) noble gases (b) halogens (c) heavy metals (d) light metals

Q.

How many elements are there in period 1?

Q.

In the modern periodic table, the period indicates the value of:
(a) Atomic number
(b) Atomic mass
(c) Principal quantum number
(d) Azimuthal quantum number.

Q. What are periods in a periodic table?

Q. 2. One gram of (94)Pu(239) is a alpha emmiter with a half life of 24400 years.given 1g sample of this plutonium how many alpha particles will emit per second

Q.

What is principal quantum number ?

Q. Three elements 'X', 'Y' and 'Z' have atomic numbers 18, 19 and 20 respectively. How many electrons are present in the M shells of these elements?

1. 8, 9, 10
2. 8, 8, 8
3. 8, 9, 12
4. 8, 10, 13

Q.

What is the name of the elements that are beyond atomic number $(\mathrm{Z}=92)$?

Q.

Name the elements from 3^rd period.

Q.

Why phosphorus is termed as a typical element?

Q.

Why is it called a periodic table?

Q.

Why is Na^- not possible??

Q.

Give any two features of the periodic table.

Q.

Among the following most reactive metal is

1. Na

2. Cs

3. Ca

4. Mg

Q. In the modern periodic table, the value of quantum number is indicated by the period.

1. Azimuthal
2. Spin
3. Principle
4. Magnetic

Q. The electronic configuration of potassium is :

1. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}4s^{2}3d^2$
2. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^1$
3. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}4s^2$
4. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^1$

Q. An element X belongs to $3^{rd}$ period and ${17}^{th}$ group, state