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प्रश्न
Name the element which has a total of four shells with two electrons in its valence shell?
उत्तर
Calcium (Ca)
संबंधित प्रश्न
Correct the statement.
Valency depends upon the number of shells in an atom.
According to atomic structure, what determines which element will be the first and which will be the last in a period?
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What is its valency?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the valency of T?
Explain why the following statement is not correct:
Atoms of elements in the same group have the same number of electron(s).
Write scientific reason.
Elements belonging to the same group have the same valency.
The metals of Group 2 from top to bottom are Be, Mg, Ca, Sr and Ba. State the common feature in the electronic configuration.
Sodium and aluminum have atomic numbers 11 and 13, respectively. They are separated by one element in the periodic table and have valencies 1 and 3 respectively. Chlorine and potassium are also separated by one element in the periodic table (their atomic numbers being 17 and 19, respectively) and yet both have valency 1. Explain.
Match the atomic number with the following:
A gaseous element with valency 2.
This question refers to the elements of the Periodic Table with atomic numbers from 3 to 18. Some of the elements are shown by letters, but the letters are not the usual symbols of the elements.
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| A | B | C | D | E | F | G | H |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| I | J | K | L | M | N | O | P |
Which of these is an element with valency 4?
