Ions

Q.

What are Isobars?

Q. What are polyatomic ions? Give examples.

Q.

Give examples of monoatomic, diatomic, triatomic, and polyatomic elements.

Q.

Element X has electronic configuration 2, 8, 18, 8, 1. Without identifying X,

(a) predict the sign and charge on a simple ion of X.

(b) write if X will be an oxidising agent or a reducing agent. Why ?

Q.

Total number of protons present in a molecule of ${\mathrm{H}}_2\mathrm{O}$ is _____.

Q. Which amongst the following is the formula of bisulphate ion?

1. $S{O}_4{}^{2-}$
2. $S{O}_3{}^{2-}$
3. $HS{O}_4{}^{-}$
4. $HS{O}_3{}^{-}$

Q.

An atom of element E contains 3 protons, 3 electrons and 4 neutrons:
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why?
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element E be?

Q.

A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be:

1. A molecule

2. A binary compound

3. An anion

4. A cation

Q.

Is hydrogen negative or positive?

Q.

A Potassium ion has a positive charge.

1. True
2. False

Q.

(a) What are polyatomic ions? Give two examples.

(b) Name the fundamental law that is involved in every equation.

Q.

67. Explain the formation of sodium chloride.

Q.

Explain the formation of sodium ion from sodium atom.

Q.

What are the cations in Group three?

Q.

Illustrate the formation of magnesium ion from magnesium atom.

Q.

Explain the formation of (i) Sodium ion, and (ii) Chloride ion, from their respective atoms giving the number of protons and number of electrons in each one of them. What is the reason for a positive charge on a sodium ion and a negative charge on a chloride ion?

Q.

The atomic numbers of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is :

(a) A

(b) B

(c) C

(d) D

Q.

Give one example of a monovalent monoatomic anion.

Q.

A group of atoms carrying a charge is known as a?

Q.

A magnesium atom changes to magnesium ion by losing _____

Q.

A chloride ion has unit _________ charge. (positive/negative)

Q.

What do we call those particles which have more or less electrons than the normal atoms ?

Q.

Do the formula for ionisation energy i.e IE =13.6 ×z²/n^{​​​​​​2} is also applicable for non -unielectron species too?

Q.

Give one example each of a trivalent cation and a trivalent anion.

Q. What is the net charge on an Ionic Compound?

Q.

A cation contains more protons than electrons.

1. True
2. False

Q.

Give one example of a polyvalent monoatomic anion.

Q. Which of the following are polyatomic ions?

1. Ammonium
2. Hydride
3. Oxide
4. Hydroxide

Q.

Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be :

(a) W

(b) X

(c) Y

(d) Z

Q.

Adding an electron to an atom will result in the formation of a cation.

1. True
2. False