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प्रश्न
Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is chemically inert.
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उत्तर
Electronic configuration of element A = (2, 8) at atomic no. 10
∴ Element C having 8 electrons in outer most orbit is chemically inert.
संबंधित प्रश्न
Give electron dot diagram of the following:
Magnesium chloride
Give electron dot diagram of the following:
methane
Element X is a metal with a valency 2; Y is a non-metal with a valency 3.
(a) Write an equation to show how Y forms as ion
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
State the following is a reduction reaction or oxidation reaction.
\[\ce{A^3+ + e- -> A^2+}\]
Five atoms are labeled A to E
|
Atoms |
Mass No |
Atomic No. |
|
A |
40 |
20 |
|
B |
19 |
9 |
|
C |
7 |
3 |
|
D |
16 |
8 |
|
E |
14 |
7 |
(a) Which one of these atoms:
(i) contains 7 protons
(ii) has electronic configuration 2,7
(b) Write down the formula in the compound formed between C and D
(c) Predict : (i) metals (ii) non-metals
Give a reason
Physical properties of isotopes are different.
Draw orbit structure diagram of sodium chloride (NaCl).
Identify the following reaction as either oxidation or reduction:
Zn → Zn2+ + 2e-
Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:
\[\ce{^12_6C}\]
Write the basic concept of Kossel – Lewis theory.
