Name the following element: An alkaline earth metal present in group 2 and period 3 .

An alkaline earth metal that is present in group two has valency 2 , and as it is present in period third it has three shells in its atom. Its electronic configuration is 2 , 8 , 2 , hence its atomic number is 12 . The metal is magnesium.

Name the following element: A trivalent metal used to make light tools.

Trivalent metals are placed in group thirteen. These metals have three electrons that can be given off to attain stability. Aluminium is the trivalent metals that has low density and is used to make light tools. Duralumin an alloy of aluminium and copper is lightweight and strong enough to make the body of the aircraft.

Give a reason for the following. Alkali metals are good reducing agents.

Alkali metals have one valence electron in their outermost shell, and undergoes oxidation easily by losing the valence electron. They transfer the electron to a non-metal and helps in reducing them. Hence, they are good reducing agents.

Give a reason for the following: Inert gases do not form ions.

All noble gases are stable, i.e., they have completely filled orbitals. Hence, they do not lose or gain electrons to form ions, or they are the least reactive elements. The noble gases are the chemical elements in group 18 of the periodic table.

Name the following element: A trivalent metal used to make light tools.

Trivalent metals are placed in group thirteen. These metals have three electrons that can be given off to attain stability. Aluminium is the trivalent metals that has low density and is used to make light tools. Duralumin an alloy of aluminium and copper is lightweight and strong enough to make the body of the aircraft.

Name the following element: An alkaline earth metal present in group 2 and period 3 .

An alkaline earth metal that is present in group two has valency 2 , and as it is present in period third it has three shells in its atom. Its electronic configuration is 2 , 8 , 2 , hence its atomic number is 12 . The metal is magnesium.

Arrange the following according to the instruction given in bracket: F , B , N , O (In the increasing order of electron affinity)

Electron affinity is the amount of energy released when an electron is added to a neutral atom. All the elements belong to same period. Electron affinity increases across a period as the atomic size decreases and effective nuclear charge increases. The increasing order of electron affinity for the given elements is: B < N < O < F

Give one phrase for the following statement: Process of formation of ions from molecules which are not in the ionic state.

The process of formation of ions from molecules which are not in the ionic state is called ionisation. From a neutral atom, positive ions are formed by removal of electron(s) and negative ions are formed by adding electron(s).

Give one phrase for the following statement: The energy released when an electron is added to a neutral gaseous isolated atom to form a negatively charged ion.

The energy released when an electron is added to a neutral gaseous isolated atom to form a negatively charged ion is known as electron affinity. This energy generally increases along a period and decreases down the group in a periodic table.

Arrange the following according to the instructions given in bracket: Li , K , Na , H (In the decreasing order of their ionisation potential)

Ionisation energy is the energy required to remove the outermost electron from a neutral atom in its ground state. On moving down a group, Ionisation energy decreases because atomic size increases and nuclear charge decreases, hence, the decreasing order of the ionisation potential of elements is: H > Li > Na > K

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Periodic Properties and Their Variations>ICSE-2020>Q 15

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10th ICSE

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The element with the highest ionization potential is:

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Important Questions on Periodic Properties and Their Variations

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Periodic Properties and Their Variations>ICSE-2019>Q 11

Give the appropriate term defined by the statement given below:

The tendency of an atom to attract electrons towards itself when combined in a covalent compound.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Periodic Properties and Their Variations>ICSE-2020>Q 16

Give one word for the following statement:

The tendency of an atom to attract electrons to itself when combined in a compound.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 1 - Periodic Properties and Their Variations>ICSE-2020>Q 17

The following table represents the elements and the atomic number. With reference to this, answer the following using only the alphabets given in the table.