Answer:
A. O, S, Se
Explanation:
If you look up Oxygen (O), Sulfur (S) and Selenium (Se) in the periodic table, you will see that these three fall under the same column. In the periodic table, elements are arranged in rows and columns. Columns are called groups. The elements that fall under the same group share similar chemical properties.
The elements given above are all in Group VIA or group 16.
S- and P-Block elements are known as Representative elements.
Groups 1-2 and Groups 13-18
Answer:
he is a weelder because of him taking a peice of metal and recreateing it.
Explanation:
I would go with C because that seems like the best answer choice
A catalyst is a substance that speeds up a chemical reaction.
