Advertisements
Advertisements
प्रश्न
An element has an atomic number of 11 and its mass number is 23. What is the arrangement of electrons in the shells? State nuclear composition of an atom of the element.
Advertisements
उत्तर
Given: Atomic no. = 11
Mass no. = 23,
Electronic configuration – (2, 8, 1)
| K | L | M |
| 2 | 8 | 1 |
Nuclear composition of an atom of the element is – 11 protons and 12 neutrons.
APPEARS IN
संबंधित प्रश्न
What name is given to the number 6.022 × 1023 ?
What is the number of molecules in 1.5 moles of ammonia ?
Calculate the number of molecules in 4 g of oxygen.
If 32 g of sulphur has x atoms, then the number of atoms in 32 g of oxygen will be :
Which of the following has the maximum number of atoms ?
What mass of nitrogen, N2, will contain the same number of molecules as 1.8 g of water, H2O ?
(Atomic masses : N = 14 u ; H = 1 u ; O = 16 u)
If one gram of sulphur contains x atoms, calculate the number of atoms in one gram of oxygen element.
(Atomic masses : S = 32 u ; O = 16 u)
How many grams of magnesium will have the same number of atoms as 6 grams of carbon ?
(Mg = 24 u ; C = 12 u )
Classify each of the following on the basis of their atomicity.
- F2
- NO2
- N2O
- C2H6
- P4
- H2O2
- P4O10
- O3
- HCl
- CH4
- He
- Ag
Which has more number of atoms?
100g of N2 or 100 g of NH3
A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?
Compute the difference in masses of one mole each of aluminium atoms and one mole of its ions. (Mass of an electron is 9.1×10–28 g). Which one is heavier?
A silver ornament of mass ‘m’ gram is polished with gold equivalent to 1% of the mass of silver. Compute the ratio of the number of atoms of gold and silver in the ornament.
The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?
Helium atom has 2 electrons in its valence shell but its valency is not 2, Explain
An element X has a mass number 4 and atomic number 2. Write the valency of this element?
