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प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Valency of elements in Group 14 and 15.
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उत्तर
4, 3
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संबंधित प्रश्न
How many groups and periods are there in the modern periodic table?
Which element has a total of two shells, with three electrons in its valence shell?
An element Z has atomic number 16. Answer the following questions on Z:
- State the period and group to which Z belongs.
- Is Z a metal or a non-metal?
- State the formula between Z and hydrogen.
- What kind of a compound is this?
Arrange the following elements in increasing order of their atomic radii:
Li, Be, F, N
How does the tendency to gain electrons change as we go down in group 17 of the periodic table? Why does it change this way?
Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
Which element has:
twice as many electrons in its second shell as in its first shell?
Four elements P, Q, R and S belong to the third period of the Modern Periodic Table and have respectively 1, 3, 5 and 7 electrons in their outermost shells. Write the electronic configurations of Q and R and determine their valences. Write the molecular formula of the compound formed when P and S combine.
State the number of elements in period 1, period 2 and period 3 of the periodic table.
Formula of ion of A is A2+. Element A probably belongs to ______ group.
