Question

If X represents an element of atomic number 9 and Y an element of atomic number 20, the compound formed by these elements would be :

• A. ionic with formula $Y{X}_2$
• B. covalent with formula $Y{X}_2$
• C. ionic with formula $YX$
• D. covalent with formula $YX$

Answer 1

Answer: (A)

ionic with formula $Y{X}_2$

Element X needs one electron to complete its octet and Y can loose two electrons to achieve its octet so they will form $Y{X}_2$