Question

For an element of modern periodic table sum of
group number and atomic number is 48. The total
number of p-electrons is equal to group number for
this element. The atomic number of element is
​

Answer 1

Answer:

Answer is 33

Explanation:

Let group no.=G

Let atomic no.=Z

so,

• G+Z=48

As we know that G belongs to 1 to 18

so,

• Z should belongs to 30 to 47

now form condition 2,we get

• No. of p electron=Group no.(but Z is greater than equal to 30)

so

• atomic no. is 33 and element is As

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Answer 2

Given:

• Group number+atomic number = 48
• Group number = Number of p-electrons

To Find:

• The atomic number of the element.

Solution:

Let 'G' be the group number and 'Z' be the atomic number. From the given data we know that,

⇒G+Z = 48 → (equation 1)

The element here is Arsenic because it is already given that the number of p-electrons is equal to its group number. p-electrons are obtained from its electronic configuration.

Electronic Configuration of Arsenic of p-orbital is: 6,6,3

P-electrons = 6+6+3 = 15 = group number

Equation 1 becomes,

⇒ 15+Z = 48

⇒ Z = 48-15 = 33.

∴ The atomic number = 33.