Atomic Number

Q.

Atomic number of calcium is 20. Calculate the number of electrons in calcium.

__

Q.

Which of the following are true for an element?

(i) Atomic number = number of protons + number of electrons

(ii) Mass number = number of protons + number of neutrons

(iii) Atomic mass = number of protons = number of neutrons

(iv) Atomic number = number of protons = number of electrons

1. (i) and (ii)

2. (i) and (iii)

3. (ii) and (iii)

4. (ii) and (iv)

Q.

The total number of electrons in a neutral calcium atom is:

1. 19

2. 18

3. 20

4. 21

Q. If the mass number of an atom is 24, then its atomic number is:

1. 24
2. 12
3. 8
4. 48

Q. The number of protons in an atom of an element is known as mass number.

1. True
2. False

Q.

The total number of protons and neutrons in the nucleus of an atom is called its ____

Q.

How is the atomic number determined?

Q.

Name a species which has only one proton and one electron.

Q.

The atom of an element has 20 protons, 20 electrons and 20 neutrons.

What is the atomic number of the element?

Q.

Define the following terms : (a) Atomic number (b) Mass number

Q. What would be the atomic number of an element if its mass number is 28?

1. 28
2. 14
3. 7
4. 56

Q. Statement 1: Atomic number of sodium is 11.
Statement 2: Number of neutrons present in a neutral atom represents its atomic number.
Choose the correct option from the following regarding these statements.

1. Only statement 1 is true
2. Only statement 2 is true
3. Both statements are true
4. Both statements are false

Q.

The atomic number Z of the nucleus is?

Q.

The following table lists the mass number and the atomic number of the five elements:

A, B, C, D, and E

Element	Mass number	Atomic number
A	3	1
B	7	3
C	35	17
D	40	18
E	37	17

How many protons are there in an atom of B?

Q.

Define atomic number.

Q.

Identify the atomic number of each of the fol­lowing atoms: Sulphur (p$=16$, n$=16$)

Q.

The Atomic number for a neutral atom could be equalized to

1. Number of protons

2. Number of electrons

3. Number of neutrons

4. All the above

Q.

State the mass and atomic number of sulfur, $S_{16}^{32}$

Q. an element M has atomic mass 19 and atomic number 9, its ion is represented by ?

Q. The answer which you have told "Francium"
can you describe it by telling it's atomic number and mass
And it's Protons, Electrons and Newtron

Q. Which element has the greatest number of electrons in the outermost shell (energy level) of its atom?

1. Fluorine
2. Helium
3. Lithium
4. Potassium

Q. Fill in the blanks with suitable words:
The fundamental particle not present in a normal hydrogen atom is ________.

Q. Statement I: A neutral atom carries no net charge.
Statement II: An atom that has equal number of protons and electrons is called a neutral atom.

1. Statement I is true and statement II is not the correct explanation.
2. Statement I is true and statement II is false.
3. Statement I is false and statement II is true.
4. Statement I is true and statement II is the correct explanation.

Q.

Difference between atomic number and mass number.

Q.

how to calculate the the atomic mass of any element

Q.

why atomic number and atomic mass number of element always a whole number?

Q.

Why is the atomic mass of chlorine atom (Cl) in decimals?