Features of Group and Periods

Q.

Are noble gases metals, nonmetals or metalloids?

Q. Which of the following elements shows properties similar to chlorine?

1. Bromine
2. Sulphur
3. Nitrogen
4. Argon

Q. The elements whose atoms have three outermost shells incomplete are called A. s-block elements B. p-block elements C. f-block elements D. d-block elements

Q.

Give reason:

Noble gases are chemically inert.

Q.

Discuss five demerits of Mendeleevs periodic table. How were these limitations overcome in the modern periodic table?

Q. Which of the following elements will show similar chemical properties with an element that has an atomic number(Z) of 15?

1. Ne (Z = 10)
2. Be (Z = 4)
3. O (Z = 8)
4. N (Z = 7)

Q.

The element with atomic number 17 has the least size among all the elements of that period.

1. True
2. False

Q. How come Argon being a noble gas does not has completely filled shells?

Q.

Which of the following elements has the electronic configuration $3{\mathrm{s}}^1$?

1. Sodium

2. Chlorine

3. Oxygen

4. Helium

Q.

What were the similarities observed by Newland when he arranged the elements in order of their increasing atomic weight as an octave in a musical scale?

Q.

State the modern periodic law. How does this law iron out the deficiencies of Mendeleevs periodic table with respect to the placement of isotopes? Explain with an example.

Q. An atom has an electronic configuration 2, 8, 5. To which of the following elements, mentioned below with their atomic numbers, it would be chemically similar?

1. F (9)
2. Na (11)
3. N (7)
4. Ar (18)

Q. the elements whose atoms have three outer most shells incomplete are called (1)s block elements (2)p block elements (3)f block elements (4)d block element

Q. Which of the following element has a total of two shells, with three electrons in its valence shell?

1. Lithium
2. Boron
3. Phosphorus
4. Oxygen

Q.

Noble gases are considered to be inert. Identify pairs of noble gases from the options:

(More than one option are correct)

1. Helium and hydrogen

2. Neon and argon

3. Helium and neon

4. Nitrogen and neon

Q. Which of the given statements is not true?

a. Valency of carbon is greater than that of nitrogen.
b. Down the group valency remains the same.
c. Across a period, valency decreases.
d. Down the group, number of shells increases.

1. a and c
2. c only
3. b only
4. d and b

Q.

An element has 1st shell fully filled and in 2nd shell has 6 electrons. Explain.

Q.

Give Newlands law of Octave?

Q.

Which of the following statements is true about element R present in ${13}^{th}$ group of the periodic table?

1. It is gas at room temperature.

2. It has oxidation state of + 4.

3. It forms $R_2{O}_3$.

4. It forms $R{X}_2$.

Q.

Which of the following statements are incorrect?

1. Noble gases occupy group 18.
2. Alkali metals occupy group 2.
3. Boron family occupy group 14.
4. Halogens occupy group 17.

Q. Which of the following pairs have dissimilar chemical properties?

1. Sodium ($\text{Na}$) and potassium ($\text{K}$)
2. Barium ($\text{Ba}$) and strontium ($\text{Sr}$)
3. Zirconium ($\text{Zr}$) and hafnium ($\text{Hf}$)
4. Calcium ($\text{Ca}$) and copper($\text{Cu}$)

Q.

What is Newlands law of octaves?

Q.

In a given shell, the order of screening effect is

1. $s>p>d>f$

2. $f>d>p>s$

3. $p<d<s<f$

4. $d>f>s>p$

Q. The number of valence electron/s present in the alkali metals is/are:

1. 1
2. 7
3. 4
4. 2