How are elements organized on the periodic tablea. symbolb. element namec. atomic massd. no set organization

Name the element in group 17, period 2. (periodic table)

Why is any chemical reaction always balanced? give reasons and explain the easiest way to solve the balancing problems in chemical equations with stoichiometric coefficients upto 20 as hit and trial doesn't always work. give full reasoning

Describe the hybridization of each carbon and nitrogen atom in each of the following structures