Flash Education

Flash-Education-Logo-Transparent-with-border-25

Question

A compound has a formula = ‘H2Y’. Y denotes a non-­metal. State the following:
1. The electronic configuration of Y.
2. The valency of Y.
3. The bonding present in ‘H2Y’
4. The bonding present in the compound formed between potassium (19K39) and ‘Y’
5. The formula of the compound formed between calcium (20Ca40) and Y.

WhatsApp

Answer

  1. The element Y needs 2 electrons to complete it’s octet, so it will have 6 electrons in the outer most shell. Hence, will have 2, 6 as the electronic configuration. It is the electronic configuration of non-metal ‘Oxygen’.
  2. 2 is the valency of element Y as it has 6 electrons in the outer most shell and needs two electrons to complete it’s octet and attain a stable state.
  3. Covalent bond is present because each of hydrogen atom shares an electron pair with element Y such that hydrogen acquires a duplet configuration and Y an octet configuration and both become stable, hence form covalent bond.
  4. Ionic bond is present between potassium (19K39) and ‘Y’ because K is a metal and Y is a non-metal.
  5. CaY is the formula for the compound formed between calcium (20Ca40) and Y by transfer of two valence electrons. (As the electronic configuration of Y matches that of Oxygen so the actual formula will be CaO)

💡 Some Related Questions

Chemical Bonding

Fill in the blanks with the correct word from the brackets:
(i) The bond between two elements in group 17[VIIA] of the periodic table is likely to be ____ [ionic/covalent].
(ii) In the reaction of Cl2 + 2KI ⟶ 2KCl + I2 the conversion of 2I to I2 is deemed as ____ [oxidation/reduction].
(iii) The covalent molecule containing three single covalent bonds is ____ [water/methane/ammonia].
(iv) The molecule of water combines with a ____ [hydrogen atom/proton/hydrogen molecule] to form a hydronium ion.
(v) For formation of an electrovalent bond between elements ‘X’ and ‘Y’ which are a metal and non-metal respectively, X should have a ____ [high/low] ionization potential and ‘Y’ a ____ [high/low] electron affinity.

Open Answer »
Close Menu