Groups

Q. How to calculate valency of element having atomic number more than 20. For ex, iron, manganese, copper, etc

Q. What is meant by catenation of carbon?

Q. What property of an element determines its chemical behaviour?

1. None of these
2. Valency of an element
3. Molar mass of the element
4. Size of an element

Q.

What is Group 7 on the periodic table called?

Q.

An atom has complete K and L shell. Is it an atom of a metal, non metal, novel gas? Justify

Q.

Given the element aluminium with atomic number 13 and number of neutrons 14.Find the mass number, number of protons, number of electrons and electronic configuration.

Q. Identify the elements which have valency as 2 and 3 respectively.

1. Helium and Lithium
2. Magnesium and Aluminium
3. Helium and Aluminium
4. Magnesium and Lithium

Q.

Name four elements of VII A group.

Q. All the elements present in the same group have same number of .

1. valence protons
2. valence electrons
3. valence ions

Q.

The electronic configuration of an element is 2, 8, 4. Which group will the element belong to?

1. Group 4

2. Group 14

3. Group 16

4. Group 2

Q. An element X belongs to group fourteen and second period of the periodic table. Its atomic number is:

1. six
2. seven
3. eleven
4. fifteen

Q.

Which one of the following does not increase while moving down the group in the periodic table?

1. Atomic radius

2. Valence electrons

3. Metallic character

4. Shells in the atoms

Q. Elements in the periodic table are classified into groups as they show similarities in properties with the elements of the respective groups. Identify the element which shows anomalous behavior so that it can be placed in two different groups of the periodic table?

1. Hydrogen (H)
2. Gold (Au)
3. Helium (He)
4. Carbon (C)

Q. Which is the longest group in the periodic table? and why?

Q. Identify the position of the element ${}_{14}X$ in the periodic table.

1. Period 4, Group 4
2. Period 3, Group 4
3. Period 4, Group 4
4. Period 3, Group 14

Q.

Elements in the ${16}^{th}$ group of the Modern Periodic Table are also called ___.

1. Chalcogens

2. Noble elements

3. Alkali metals

4. Halogens

Q.

There is an element X with atomic number 16. A student was assigned a task to write down the features of the group to which this element belongs to. Help him to find out the group number of the element X so that he can complete his task.

1. sixteen

2. thirteen

3. fifteen

4. fourteen

Q.

The valence of noble gases is

1. 1

2. 0

3. 2

4. None of these

Q.

How did the group number of s block element ?

Q. In general, the number of electrons in the outermost shell of a metal atom is:

1. 1
2. 1-3
3. 1-8
4. 8

Q. In the long form of periodic group lanthanides are placed in the:

1. $2^{nd}$ period
2. $5^{th}$ period
3. $6^{th}$ period
4. $7^{th}$ period

Q. [TBQ.VI.(4)]
State any five features of modern periodic table.

Q. The elements present in the ${17}^{th}$ group of the modern periodic table are otherwise known as ____.

1. Chalcogens
2. Pnicogens
3. Alkali metals
4. Halogens

Q.

An element has an atomic number 16. State:

(i) The period to which it belongs.

(ii) The number of valence electrons.

(iii) Whether it is a metal or non-metal.

Q. In general, the properties that decrease and increase down a group in the periodic table respectively are:

1. electron gain enthalpy and electronegativity
2. electronegativity and atomic radius
3. atomic radius and electronegativity
4. electronegativity and electron gain enthalpy

Q. The type of elements present in group 17 [VIIA] are :

1. alkali metals
2. alkaline earth metals
3. noble gases
4. halogens

Q.

What is valency?

Q.

Question 4
Why do you think the noble gases are placed in a separate group?

Q. The group in which all the elements do not have same number electrons in their valence shell is :

1. first
2. zero
3. second
4. seventh

Q.

The positions of three elements A, B and C in the Periodic Table are shown below:

Giving reasons, explain the following:

(iii) Element B has a valency of 1.