Chemistry
Assertion (A): Elements with high electronegativity are usually non-metals.
Reason (R): Non-metallic atoms have high ionisation potential & tend to gain electrons.
- Both A & R are true and R is the correct explanation of A.
- Both A & R are true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true.
Answer
Both A & R are true and R is the correct explanation of A.
Reason — Electronegativity is the tendency of an atom to attract electrons in a chemical bond. Non-metals readily attract electrons and have high electronegativity. Hence, the assertion (A) is true.
Non-metals don’t lose electrons easily, and they tend to gain electrons so they have high ionization energy and are highly electronegative. Hence, the reason (R) is true and it explains why elements have high electronegativity.
Related Questions
The following table shows the electronic configuration of the atoms A, B, C and D.
Element A B C D Electronic configuration 2, 8, 8, 2 2, 6 2, 8, 7 2, 4 (a) Write the formula of the compound formed between:
- A and B
- D and C
(b) Which of the above elements will exhibit catenation?
Assertion (A): Noble gases Ne, Ar have electron affinity zero.
Reason (R): Greater the value of electron affinity, the more electronegative is the element.
- Both A & R are true and R is the correct explanation of A.
- Both A & R are true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true.
The oxide of the metallic element with three valence electrons, in its third shell is:
- Basic
- Weakly acidic
- Amphoteric
- Strongly basic
'ACl2' is the formula of an electrovalent solid. 'A' is likely to be in the same group in period 3, as the element given below present in period 2.
- Be
- Li
- C
- B