Answer:
21
Step-by-step explanation:
27÷3 is 9 and 21÷3 is 7
Answer:
Step-by-step explanation:
<h2>ANSWER:</h2><h3>Non Elements</h3><h3 /><h2>NOTES:</h2><h3>With the exception of HYDROGEN, the elements on the left side of the periodic table are METALS. Elements on the right side of the periodic table are NONMETALS.</h3>