Question

the atomic numbers of elements A B C and D are 3,9,4 and 8 respectively. elements having metallic nature among these are​

Answer 1

According to given atomic numbers, 3,9,4,8 element A and C is metallic in nature.

Explanation:

1. Metals are defined as those species that have 1 to 3 electrons present in their outermost shell.
2. Nonmetals are those elements in which 4 to 7 electrons are present in their outermost shell.
3. By counting the outermost shell electrons of the given elements we can easily identify the metallic nature.

Element A:

• Atomic number: 3
• The elements configuration is 2,1
• The outer shell of this element is having 1 electron and so it is metallic in nature.
• The name of the element is Lithium (Li).

Element B:

• Atomic number:9
• The elements configuration is 2,7
• The outer shell of this element is having 7 electrons and so it is non-metallic in nature.
• The name of the element is Fluorine(F)

Element C:

• Atomic number:4
• The element's configuration is 2,2.
• The outer shell of this element is having 2 electrons and so it is metallic in nature.
• The name of the element is Beryllium (Be).

Element D:

• Atomic number:8
• The element's configuration is 2,6.
• The outer shell of this element is having 6 electrons and so it is non-metallic in nature.
• The name of the element is Oxygen (O).

Answer 2

Explanation:

• The elements having metallic nature among these are 'A' and 'C'. 'A' has a more metallic character over 'C'.
• Metals have 1 to 3 electrons in their outermost shell whereas none metals have 4 to 7 electrons in the outermost shell.
• As we go from Left to Right of the Periodic table atomic number of elements increases but atomic size decreases hence ease to lose electrons decreases, so their metallic character decreases.
• Element 'A' has 1 electron in its outermost shell, having a metallic character. The element is Lithium.
• Element 'B' has 7 electrons in its outermost shell this being non-metallic. The element is Fluorine.
• Element 'C' has 2 electrons in its outermost shell and is metallic. The element is Beryllium.
• Element 'D' has 6 electrons in its outermost shell so is non-metallic.
• The element is Oxygen.