Question

An element of atomic mass 40 has 2, 8, 8, 2 as the electronic configuration. Which one of the following statements regarding this element is not correct?
(A) It forms an amphoteric oxide
(B) It belongs to IIA group
(C) It belongs to IV period
(D) It has 20 neutrons

Answer 1

Hint : The number of protons in the nucleus of every atom of a chemical element is known as the atomic number or proton number (symbol Z). A chemical element's atomic number is the only way to identify it. It is the same as the nucleus' charge number. The atomic number is also equivalent to the number of electrons in an uncharged atom.

Complete Step By Step Answer:
Calcium is an atomic number 20 chemical element with the symbol Ca. Calcium is a reactive alkaline earth metal that develops a black oxide-nitride layer when exposed to air. It shares the same physical and chemical characteristics as its heavier homologues strontium and barium. After iron and aluminium, it is the fifth most plentiful element in the Earth's crust and the third most plentiful metal. Calcium carbonate is the most prevalent calcium compound on Earth, and it may be found in limestone and the fossilised remains of early marine life. Other calcium compounds include gypsum, anhydrite, fluorite, and apatite. The term comes from the Latin word calx, which means "lime," and refers to the product of heating limestone.
By adding 2, 8, 8, 2 we get 20 which corresponds to calcium.
The atomic mass of Ca is 40. Hence the number of neutrons corresponds to 20.
From the periodic table one can tell that It belongs to the IIA group and it belongs to the IV period.
Hence option a is incorrect.
It forms Basic Oxide always.

Note :
Metals tend to create basic oxides, non-metals prefer to produce acidic oxides, and elements at the metal-non-metal border tend to create amphoteric oxides (metalloids). Metallic oxides are basic in nature because they create salt and water when they react with dilute acids. Because group 1 and 2 oxides are strongly alkaline in nature, they are referred to as alkaline metals and alkaline Earth metals, respectively.