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प्रश्न
Which of the following would weigh the least?
(Atomic masses C = 12, 0 = 16, Na = 23)
पर्याय
2 gram atoms of oxygen
One mole of sodium
22.4 litres of carbon dioxide at STP
6.023 × 1022 atoms of carbon
उत्तर
6.023 × 1022 atoms of carbon
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संबंधित प्रश्न
Write the electronic configuration of K and Ne.
Name any two elements of group one and write their electronic configurations. What similarity do you observe in their electronic configurations? Write the formula of oxide of any of the aforesaid elements.
Classify the following elements into metals, non-metals and metalliods
As, C, Hg, Mg, S, Si
The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is:
(a) O, F, N
(b) N, F, O
(c) O, N, F
(d) F, O, N
On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?
(a) increases
(b) decreases
(c) remain the same
(d) first increases then decreases
What do you understand by periodicity?
How does the number of:
valency vary on moving from left to right in the second period of the periodic table?
name the elements in period 1.
An element A has 2 electrons in its fourth shell. State:
is it a metal or non-metal
Complete the table pertaining to the following elements given in Column I.
| Column I Elements | Atomic Number | Electronic Configuration | Underline the element present in that group |
| 1. Hydrogen | 1 | ______ | Be/Na/Ca |
| 2. Carbon | 6 | ______, ______ | N/P/Si |
| 3. Nitrogen | 7 | _______, ______ | C/P/S |
| 4. Oxygen | 8 | _______, ______ | N/S/Cl |
| 5. Sulphur | 16 | _____, ______, _______ | O/N/F |
| 6. Chlorine | 17 | _____, ______, ______ | I/O/S |
