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Question
Choose the correct answer from the options given below:
If an element A belongs to Period 3 and Group II, then it will have
A. 3 shells and 2 valence electrons
B. 2 shells and 3 valence electrons
C. 3 shells and 3 valence electrons
D. 2 shells and 2 valence electrons
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Solution
3 shells and 2 valence electrons
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RELATED QUESTIONS
Arrange the following as per the instruction given in the brackets:
He, Ar, Ne (Increasing order of the number of electron shells)
Electron affinity values generally _______ across the periods left to right and ______ down the group top to bottom.
Give reason:
Electron affinity of halogens is comparatively high ?
Explain the following:
Halogens have a high electron affinity.
A, B, C are three elements in which B is an inert gas other than helium. With this information complete the following table.
| Element | Atomic number | No. of electrons in the valence shell | Group to which the element belongs |
| A | Z − 1 | - | - |
| B | Z | - | - |
| C | Z + 1 | - | - |
Also, explain the following:
- Electron affinity of element A is more than that of element C.
- lonization energy of element C is less than that of element A.
- Electron affinity of B is zero.
State whether the following statement is true or false
The elements with higher electron affinity have higher ionization potential.
Explain
Halogens have high electron affinity.
The electron affinity of an element X is greater than that of element Y.
How is the oxidising power of X likely to compare with that of Y?
The electron affinity of an element X is greater than that of element Y.
How is the electronegativity of X likely to compare with that of Y?
The electron affinity of an element X is greater than that of element Y.
State whether X is likely to be placed to the left or to the right of Y in the periodic table.
