Chemistry
An element Y has 2 electrons in the 2nd orbit and X has 7 electrons in its 3rd orbit. The compound formed between them has the formula:
- XY2
- YX2
- YX
- Y7X2
Answer
YX2
Reason — As element Y has 2 electrons in its 2nd orbit, so the electronic configuration of Y is [2, 2] and X has 7 electrons in the third orbit so its electronic configuration is [2, 8, 7]
Y donates it two valence electrons and completes its octet and two atoms of X accept the electrons to attain the octet, hence the compound formed is YX2.
Related Questions
The characteristic of an electrovalent compound is that :
- It is formed by sharing of electrons
- It is formed between metals and non-metals
- It is formed between two non-metals
- It often exists as a liquid.
When a metal atom becomes an ion:
- It loses electrons and is oxidized.
- It gains electrons and is reduced.
- It gains electrons and is oxidized
- It loses electrons and is reduced.
An atom is neutral, its nucleus contains:
P — Negatively charged particles.
Q — Neutral particles.
R — Positively charged particles.
- Only P
- Only Q
- Only R
- Both Q and R
Postulates of modern atomic theory are:
P — Atoms of an elements may not be alike.
Q — Atoms of elements combine in small whole numbers to form molecules.
R — Atoms can neither be created nor destroyed.
- Only P
- Only Q
- Only R
- Both P and Q