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प्रश्न
An element A has 2 electrons in its fourth shell. State:
is it a metal or non-metal
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उत्तर
It's a metal.
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संबंधित प्रश्न
The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.
- Calculate the average atomic mass of elements A and C.
- Compare the average atomic mass with atomic mass of B.
- What could the elements A, B and C be?
Which element has a total of two shells, with three electrons in its valence shell?
Choose the most appropriate answer of the following:
Which of the following would weigh the least?
(A) 2-gram atoms of Nitrogen.
(B) 1mole of Silver
(C) 22.4 liters of oxygen gas at 1 atmospheric pressure and 273K
(D) 6.02 x 1023 atoms of carbon.
[Atomic masses: Ag=108, N=14, O=16, C=12]
What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?
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 is its atomic number?
Name the element of lower nuclear charge out of Be and Mg.
Formula of ion of A is A2+. Element A probably belongs to ______ group.
Name the elements in the correct order of their increasing atomic numbers present in the first, second, and third short periods of the periodic table.
State which of the elements are –
- metallic
- non-metallic
- noble gases
in each of the periods 2 and 3.
Select the correct answer from the options given below.
Is the group number of the element whose atomic number is 4.
