Question

Two elementsXandYhave atomic numbers 18and20 respectively and their mass

number is 40.

a)What is the relationship betweenXandY.

b)Are their properties same or different?Explain.

c)Electronic configuration of which out of K,K+,X,Y are similar?

d)Which out of XandY will form salt with S(Atomicnumber=16).Write the formula​​

Answer 1

Answer:

Explanation:

(a) The elements X and Y are isobars.

(b) Their chemical properties are different.

(c) Na has more electrons than .

Explanation:

Isobars have same atomic mass but different atomic number.

Atomic number defines number of proton in the nucleus. If the atomic number are different then the atomic structure of the elements is also different. So, the elements have different chemical properties with same mass.

The "plus" sign in the sodium indicates that it lost an electron. So, the Na element has one more electron than .