Chemical Symbols

Q.

What does the symbol 'N' stand for in the periodic table?

1. One molecule of Nitrogen

2. One atom of Nitrogen

3. One atom of Neon

4. One molecule of Neon

Q.

Is atomic mass the sum of the number or mass of protons and neutrons.

If it is sum of number , then why is it called atomic MASS

And if it is sum of mass then how do we know the no of neutrons and proton sin the atom.

Q.

The mass of a neutron is nearly equal to the mass of a proton.

1. True
2. False

Q.

Lithium is a metal whose electronic configuration is 2 and 1 including 3 protons 3 electrons and 3 neutrons. So, if we remove 1 electron from lithium to make it stable. Then , why would we call it lithium as it has 3 protons 3 electrons and 3 neutrons. But , after removal of 1 electron only 2 electrons are left. So, why would we call it lithium then.

Q.

What is the shorthand representation of an element?

1. Symbol

2. Short

3. Version

4. Other

Q. The symbol 'Cu' is used for _____.

1. copper

2. cobalt

3. silver

4. calcium

Q.

What is meant by an atomic symbol? Write the atomic symbols of chlorine and copper.

Q.

State five main assumptions of Daltons atomic theory of matter.

Q.

An element is represented by a chemical formula and a compound is represented by a symbol.

1. True
2. False

Q.

Element Na (Sodium) can be called as__________.

1. monoatomic

2. diatomic

3. polyatomic

4. triatomic

Q.

Give the symbol of the Arsenic

Q.

The mass of a neutron is nearly equal to the mass of the proton.

1. True
2. False

Q.

Paramanu is made up of two or more anus.

1. True
2. False

Q.

Match the correct order of elements to corresponding to the atomic structure.

1. C, F, E, B, A, D

2. C, E, F, A, B, D

3. C, F, E, D, B, A

4. E, F, C, A, D, B

Q.

A mixture of Oxygen and nitrogen oxide is used as a medical anaesthesia gas.

1. True
2. False

Q.

How to calculate the no of electrons in any atom?

Q.

1. Choose the correct answer from the options given below.

(i) The ratio between the number of molecules in $2\mathrm{g}$ of hydrogen and $32\mathrm{g}$ of oxygen is: [Given that $\mathrm{H}=1,\mathrm{O}=16$]

1. $1:2$

2. $1:0.01$

3. $1:1$

4. $0.01:1$

Q.

Answer in one word the smallest unit of matter which can exist independently.

Q.

Which of the following is correct regarding the chemical symbol of an element?

1. It tells us how the reaction will occur.

2. It tells how the reactants react with compounds.

3. It stands for one atom of the element.

4. It displays the electronic configuration of an element.

Q.

Based on atomicity, which type of molecule is water?

1. Tetraatomic

2. Monoatomic

3. Triatomic

4. Polyatomic

Q.

Who developed atomic theory of matter?

1. Robert boyle

2. John dalton

3. Antoine lavoisier

4. Sir humphry davy

Q.

Which symbol was used by Dalton to represent 'Carbon'?

1. Circle

2. Star

3. Square

4. Rectangle

Q.

Atomic number = number of protons and number of protons = number of electrons. So can we say that atomic number = number of electrons

Q.

The number of electrons in a neutral atom with atomic number X and mass number Y will be:

1. (X + Y)

2. X

3. (X - Y)

4. (Y - X)

Q.

The Greek philosopher who first used the word atom?

Q.

4. Write the symbols of these elements.

v. Sulphur

Q. Which of the following is the correct symbol of potassium?

1. Ag
2. P
3. W
4. K

Q.

How many electrons are there in an atom of Lithium?

1. 2

2. 4

3. 3

4. 8

Q.

Based on atomicity, which type of molecule is water?

1. Tetraatomic

2. Monoatomic

3. Triatomic

4. Diatomic

Q.

What will be the atomicity of:

a) The gas that was taken inside the body during respiration and is released during photosynthesis.

b) The red colored element which we use in matchsticks.

c) The pale blue gas which forms a layer that absorbs the sun's UV radiation.

1. 2, 3, 4 respectively

2. 2, 4, 3 respectively

3. 2, 4, 2 respectively

4. 4, 2, 2 respectively