(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

Define a chemical bond.

Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.

Answer the following in respect of element `31/15 P`

Give its electronic configuration

What is the main characteristic of the last element in each period of the periodic table?

Mention the basic tendency of an atom which makes it to combine with other atoms.

Fill in the blank:

The horizontal rows in the periodic table are called _____________.

An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.

What will be the formula of its phosphate?

Elements A, B and C have atomic number 17, 19 and 10 respectively.

State which one is a non-metal.

An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.

Is it larger or smaller than caesium (Cs)?

Five atoms are labelled from A to E.

(a) Which one of these atoms:
(i) contains 7 protons,
(ii) has an electronic configuration 2, 7?
(b) Write down the formula of the compound formed between C and D.
(c) predict which are: (i) metals, (ii) non-metals?

The electronic configuration of an element T is 2, 8, 8, 1.

What is the group number of T?

The electronic configuration of an element T is 2, 8, 8, 1.

What is the period number of T?

Match the atomic number 4, 8, 14, 15 and 19 with each of the following:
(a) A solid non-metal of valelncy 3.
(b) A gas of valency 2.
(c) A metal of valency 1.
(d) A non-metal of valency 4

Elements X, Y, and Z have atomic numbers 6, 9 and 12 respectively. Which one forms an anion?

Give electron dot diagram of the following:
Magnesium chloride

Give electron dot diagram of the following:
nitrogen

Give electron dot diagram of the following:
methane

(i) How many atoms of each kind are present in the following molecules: calcium oxide, chlorine, water, carbon tetrachloride?
(ii) How many electrons are required for their octet structure?

Complete the following:

Name an alkali metal in period 3 and halogen in period 2.