<span>They keep the same form no matter what tense is used.
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Answer:
When manganese(IV) oxide is added to hydrogen peroxide, bubbles of oxygen are given off. To make oxygen in the laboratory, hydrogen peroxide is poured into a conical flask containing some manganese(IV) oxide. The gas produced is collected in an upside-down gas jar filled with water.
A silver atom has to lose only 1 electron to achieve a <span>pseudo-noble-gas electron configuration.</span>
Answer:
Non-metals tend to gain electrons
Explanation:
The reactivity of metals increases as you move left in a period and as you move down in a group, so Marie needs to know the period and group of the element inside each box. Boxes that show locations in groups 1 or 2 or in period 8 contain the most reactive elements.
