Question

Electronic configuration of an element is 2,8,1. The atomic number of this element is----and its symbol is ---एक तत्व का इलेक्ट्रॉनिक विन्यास 2,8,1 है। इस तत्व की परमाणु संख्या ---- और इसका संकेत ----है। *

10 , Ne

7 , N

17 , Cl

11 , Na​

Answer 1

Answer:

(d) Na

Explanation:

electronic configuration of Na(sodium) is 2,8,1

the atomic number of sodium is 11

Answer 2

The atomic number of the given element is 11 and the symbol of the given element is Na.

• According to the chemistry, the number of protons present in an element is known as the atomic number of that element.
• And, in normal atomic state, the number of electrons is equal to the number of protons of that atom.
• In the given element, the total number of electrons is (2+8+1) = 11.
• So, the number protons will be also 11 and the atomic number will be 11 too.
• And, according to the modern periodic table the 11 atomic number is acquired by the sodium which has a symbol of Na.