Elements A, B and C have atomic numbers 9, 20 and 10 respectively.
(i) State which one is (1) a non-metal; (2) a metal; (3) chemically inert.
(ii) Write down the formula of the compound formed by two of the above elements.

Question

Elements A, B and C have atomic numbers 9, 20 and 10 respectively.
(i) State which one is (1) a non-metal; (2) a metal; (3) chemically inert.
(ii) Write down the formula of the compound formed by two of the above elements.

KnowledgeBoat · Accepted Answer

(i) The electronic configurations of the elements are: A[9] = [2, 7] B[20] = [2, 8, 8, 2] C[10] = [2, 8] (1) A is a non-metal as it will gain electron to attain a stable octet. (2) B is a metal as it will lose two electrons to attain a stable octet. (3) C is chemically inert as it's valence shell is completely filled. (ii) A has 7 electrons in the outermost shell. Therefore, it will try to gain one electron to attain stable octet, hence, A has valency [1-] As B has 2 in the outermost shell. Therefore, it will try to lose 2 electrons to attain stable octet, hence, B has valency [2+] Since valency of A is 1- and valency of B is 2+ Formula of the compound: So, we get the formula as

Chemistry

Elements A, B and C have atomic numbers 9, 20 and 10 respectively.
(i) State which one is (1) a non-metal; (2) a metal; (3) chemically inert.
(ii) Write down the formula of the compound formed by two of the above elements.

Atomic Structure

Related Questions

The atom of aluminium is represented by ²⁷Al₁₃. State the number of :
(a) electrons
(b) protons
(c) neutrons
(d) the arrangement of electrons
in the different orbits or shells in one atom of aluminium.

Define : Proton, Electron, Neutron.

Chemistry

Elements A, B and C have atomic numbers 9, 20 and 10 respectively.(i) State which one is (1) a non-metal; (2) a metal; (3) chemically inert.(ii) Write down the formula of the compound formed by two of the above elements.

Atomic Structure

Related Questions

The atom of aluminium is represented by 27Al13. State the number of :(a) electrons(b) protons(c) neutrons(d) the arrangement of electronsin the different orbits or shells in one atom of aluminium.

Define : Proton, Electron, Neutron.

Elements A, B and C have atomic numbers 9, 20 and 10 respectively.
(i) State which one is (1) a non-metal; (2) a metal; (3) chemically inert.
(ii) Write down the formula of the compound formed by two of the above elements.

The atom of aluminium is represented by ²⁷Al₁₃. State the number of :
(a) electrons
(b) protons
(c) neutrons
(d) the arrangement of electrons
in the different orbits or shells in one atom of aluminium.