The following are some statements about modern periodic table

i) It is based on electronic configuration

ii) It contains 7 periods and 18 groups

iii) Each period begins with a nonmetallic element

(i) is correct since the modern periodic table is based on a electronic configuration or atomic number

(ii) is correct as the modern periodic table contains 7 horizontal rows called periods and 18 vertical columns called groups

(iii) is incorrect as each period except first one begins with a metallic element and not a non-metallic element

Therefore, Option B is the correct answer.