Advertisements
Advertisements
Question
From the symbol `""_12^24"Mg"`
, state the mass number, the atomic number and electronic configuration of magnesium.
Advertisements
Solution
Mass number = 24
Atomic number = 12
No. of electrons = 24 - 12 = 12
Electronic configuration = 2, 8, 2
APPEARS IN
RELATED QUESTIONS
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
Draw the orbital diagram of `""_20^40"Ca"^(2+)` ion and state the number of three fundamental particles present in it.
Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one:
- Forms an anion
- Forms a cation
- Has four electrons in its valence shell?
State the main postulates of Dalton’s atomic theory.
An element ‘A’ has mass number 23 and atomic number 11. State the –
- no. of neutrons in its shell,
- electronic configuration of the element ‘A’.
What is common salt? Name the elements present in it. Write the formula of common salt. What are the atomic number and the mass number of the elements? Write the ions in the compound.
What is mass number of an atom?
Name the 3 sub-atomic particles of an atom.
Match the following:
| Column A | Column B | ||
| 1. | Mass of proton | a. | +1 |
| 2. | Mass of electron | b. | -1 |
| 3. | Charge of electron | c. | 9.31 x 10-28g |
| 4. | Charge of proton | d. | 1.67 x 10-24g |
What are the letters A, Z, and X stand for?
