Question

The atomic number of three elements a,b and c are 5,7 and 10 respectively. Which two of these will have similar properties? Give reasons.

Answer 1

Answer:

None of these will have similar properties but they will have Very close properties.

Explanation:

Reactivity of B and C will be almost same because there is very less difference in their Atomic no.

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Answer 2

Answer:

Element c is a Nobel Element.

Element a and b will have very close property but none of them have exact similar property.

Explanation:

• Element a:

Atomic no: = 5  , No: of protons = 5 ,  No: of electrons = 5 , Electronic configuration = 2 , 3

Valency = 5

• Element b:

Atomic no: = 7 ,  No: of protons = 7  , No: of electrons = 7 , Electronic configuration = 2 , 5

Valency = 3

• Element c:

Atomic no: = 10 ,  No: of protons =  10  ,  No: of electrons = 10 , Electronic configuration = 2 , 8

Valency = 0

• Electrons which are found in the outermost shell of an atom are  known as valence electrons. The number of valence electrons determines the valency of that particular atom.

• The valence electrons of an atom are the ones that take part in any chemical reactions. Hence the chemical properties of an element depend on its valence electrons.

• The properties of the electrons of an atom are determined  by the number of protons present in the nucleus . Thus the chemical properties of an element, is determined by the number of protons in the nucleus which is called the atomic number.

• Since the properties of the electrons depend upon the number of protons , each different atomic number corresponds to a  different kind of atom and makes up a different chemical element.
• The atomic number of three given elements a, b and c are 5,7 and 10 which are different from each other . So, Their Chemical properties are also different.

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