Question Video: Identifying the Terms That Complete a Statement about How Metals React | Nagwa Question Video: Identifying the Terms That Complete a Statement about How Metals React | Nagwa

Question Video: Identifying the Terms That Complete a Statement about How Metals React Science • First Year of Preparatory School

Fill in the blanks: Metals tend to _ electrons during chemical reactions to form _ ions.

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Video Transcript

Fill in the blanks. Metals tend to blank electrons during chemical reactions to form blank ions. (A) Lose, positive; (B) gain, negative; (C) lose, negative; (D) gain, positive.

In this question, we need to choose the two correct words to fill in the blanks and complete the statement. First of all, metal atoms tend to have less than four electrons in their outermost energy level. A sodium atom is an example of a metal atom. We can see in the energy level diagram that a sodium atom has one electron in its outermost energy level. On the other hand, nonmetal atoms tend to have more than four electrons in their outermost energy level. A chlorine atom is an example of a nonmetal atom. We can see in the energy level diagram that a chlorine atom has seven electrons in its outermost energy level.

When sodium reacts with chlorine, each sodium atom loses the one electron in its outer energy level. When chlorine reacts, each chlorine atom gains one electron in its outer energy level.

Let’s summarize how atoms lose or gain electrons using these examples. When metals react, their atoms tend to lose electrons. And when nonmetals react, their atoms tend to gain electrons. This means that answer choices (B) and (D) are incorrect because metals tend to lose electrons during chemical reactions, not gain them.

Let’s take a look at our example atoms again. When a sodium atom loses an electron, it forms a positive ion. This ion has the symbol notation Na+. A sodium atom has 11 positively charged protons in the nucleus and 11 negatively charged electrons in the energy levels. So, like all atoms, the sodium atom is uncharged, or neutral. When a sodium atom loses one electron, it ends up with 10 electrons. But it still has 11 protons in its nucleus. So, the charge of the sodium ion is positive one.

Now let’s take a look at chlorine. A chlorine atom has 17 protons and 17 electrons. When a chlorine atom gains one electron, it ends up with 18 electrons. But it only has 17 protons in its nucleus. So, the charge of the chloride ion is negative one. So now we know that when the chlorine atom gains an electron, it forms a negative ion.

These examples have helped us to see that metals tend to form positive ions and nonmetals tend to form negative ions during chemical reactions. Therefore, answer choice (A) must be the correct answer. Metals tend to lose electrons during chemical reactions to form positive ions.

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