4. The elements calcium and strontium have similar chemical properties because they both have the same A) atomic number
B) mass number
C) number of valence electrons
D) number of completely filled sublevels

Answer c

Explanation:

The similar properties between calcium, strontium and potassium are : All of them have two electrons in the outermost shell. All are metals. Their oxides are alkaline.

the child will have heterozygous dominant chromosomes as characters of his father are dominant over the characters of his mother.

the child is heterozygous