Question

an element with an atomic number of ------------ will form a basic oxide. option 17 , 20,6 , 7

Answer 1

Hi , there !!

Metal oxide form basic nature .

so element have matal is Ca which have Atomic number is 20 .

so your answer is 20 .

hope it helps you !!
thanks !!

Ranjan kumar

Answer 2

An element with an atomic number of ------------ will form a basic oxide. option 17 , 20,6 , 7

Answer :

Correct answer is option 20---element Calcium

Reason :

• As we know that All metallic oxide are basic in nature.
• Because element with atomic number 17 ,6 and 7 are non metals which form non metallic oxides which are acidic in nature.
• For example : 2Ca + O2----------> 2CaO                                                        and calcium oxide is basic in nature .
• Test : CaO +H2O--->Ca(OH)2            
• we can test it with red litmus dipped in calcium hydroxide which tells that it is basic in nature .