`""_(35)^(79)Br` तथा `""^(79)Br` प्रतिक मान्य है, जबकि `""_(79)^(35)Br` तथा `""^(35)Br` मान्य नहीं है। संक्षेप में कारन बताइए।

Symbols ""_(35)^(79)Br and "^(79)Br can be written, whereas symbols ""_(79)^(35)Br and ""^(35)Br are not acceptable. Answer briefly.

Symbols ""_(35)^(79)Br and ""^(79)Br can be written, whereas symbols ""_(79)^(35)Br and ""^(35)Br are not acceptable. Answer briefly.

Symbols ._(35)^(79)Br and .^(79)Br can be written whereas symbols ._(79)^(35) Br and ._(35)Br are not accepted. Answer in brief.

Symbols ._(35)^(79) Br and ^(79)Br can be written whereas symbols _(79)^(35) Br and ^(35)Br are not acceptable. Answer briefly.

Symbols ._(35)^(79) Br and ^(79)Br can be written whereas symbols _(79)^(35) Br and ^(35)Br are not acceptable. Answer briefly.

Symbols _ 35 ^(79) Br and _ ^(79) Br can be written, whereas symbols _ 79 ^(35) Br and _ ^(35) Br are not acceptable. Answer briefly.

Which of the following symbols are not acceptable ? (i) ._(35)^(79)Br (ii) .^(79)Br (iii) ._(79)^(35)Br (iv) ._(35)Br