1. radio button

                 <input type="radio" name="optradio" value="">
                 

A radio input should have type , name and value

2. with label

                 <div class="radio">
                  <label><input type="radio" name="optradio" checked  value="" >Option 1</label>
                </div>
                <div class="radio">
                  <label><input type="radio" name="optradio"  value="">Option 2</label>
                </div>

                

3. Inline radio button

               <label class="radio-inline"><input type="radio" name="optradio" checked>Option 1</label>
              <label class="radio-inline"><input type="radio" name="optradio">Option 2</label>
              <label class="radio-inline"><input type="radio" name="optradio">Option 3</label>