A attract a core pair of electrons toward itself
Its Iron and Potassium because if you look at the periodic table,and you go down the list of metals, you can see what metals are there.
<span> the part separating two chambers, such as that between the nostrils or the chambers of the heart</span>
Answer:
Bonds are broken and new bonds are formed during chemical reactions only.
Explanation:
- A physical change in a substance doesn't change what the substance is.
- In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
- Physical changes can be reversed, chemical changes cannot be reversed with the substance changed back without extraordinary means, if at all. For example, a cup of water can be frozen when cooled and then can be returned to a liquid form when heated.
So, the right choice is:
Bonds are broken and new bonds are formed during chemical reactions only.
