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:

1 Isobars

2 different

3 K- and y . K+ and x

4 Y

Explanation:

Isobars have same mass number but diff atomic number.

Diff atomic no. means diff no. of protons meaning diff properties.

x is argon(19) , k is potassium(19) , y is calcium (20)

argon is noble ie unreactive while calcium is alkali earth metal(electro positive) and reacts with electo negative element like s