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Question
Name or state following with reference to the element of the first three periods of the periodic table.
A metal in period 3 having valency 3.
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Solution
Metal in period 3 is A1 [Aluminium]
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RELATED QUESTIONS
Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in Group 1 and Group 2, respectively. Compare their following characteristics in tabular form:-
(a) The number of electrons in their atoms
(b) The sizes of their atoms
(c) Their metallic character
(d) Their tendencies to lose electrons
(e) The formula of their oxides
(f) The formula of their chlorides
List any two properties of the elements belonging to the first group of the modern periodic table.
Which element has twice as many electrons in its second shell as in its first shell?
An element X belong to 3rd periods and group II of the periodic table state:
the number of valence electrons,
Name the element of lower nuclear charge out of Be and Mg.
The position of certain elements in the Modern Periodic Table is shown below:
| Group → Period ↓ |
1 | 2 | 3 to 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 1 | G | H | |||||||
| 2 | A | I | B | C | |||||
| 3 | D | E | F |
Using the above table answer the following questions giving reasons in each case:
- Which element will form only covalent compounds?
- Which element is a non-metal with valency 2?
- Which element is a metal with valency 2?
- Out of H, C, and F which has the largest atomic size?
- To which family does H, C, and F belong?
What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?
Supply the missing word from those in bracket:
If an element has one electron in its outermost energy level [shell] then it is likely to be _______.
Name the period which is the shortest period of the periodic table.
Name or state following with reference to the elements of the first three periods of the periodic table.
The number of electron shells in elements of period 1, period 2, and period 3.
