Advertisements
Advertisements
प्रश्न
Differentiate mass number from atomic number.
Advertisements
उत्तर
| Sr. No. | Atomic number | Mass number |
| 1. | The number of electrons or protons in an atom is called atomic number of that atom. | The number of protons and neutrons present is its nucleus is called mass number of that atom. |
| 2. | It is represented by the letter Z | It is represented by the letter ‘A’. |
| 3. | Example: Helium (He) has 2 protons and two electrons hence its atomic number will be 2. | Example: Sodium (Na) has 11 protons and 12 Neutrons hence its mass number A= 11 + 12 = 23 |
APPEARS IN
संबंधित प्रश्न
Multiple Choice Questions
If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be
The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement.
FILL IN THE BLANK
Atomic theory of matter was given by ..........................
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
The atomic number and mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement?
What is meant by the 'atomic number of an element'?
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Carbon [At. no. = 6, Mass no. = 12]
What is atomic number?
The elementary particles such as protons and neutrons are collectively called ______.
‘A’ is denoted by ______.
