Question

match each description to the correct element. has the same number of electron shells as beryllium has 4 valence electrons more reactive than boron has 2 electron shells has 3 electron shells has 2 valence electrons less reactive than aluminum has the same number of electron shells as silicon is your work saved? go back to lab room

Explanation:

Magnesium (Mg)

Step1: Electron shells

Beryllium (Be) has 2 electron shells. Magnesium (Mg) has 3 electron shells. Silicon (Si) has 3 electron shells. So, "has the same number of electron shells as Silicon" matches Mg.

Step2: Reactivity

Magnesium is more reactive than Boron. So, "more reactive than Boron" matches Mg.

Step3: Valence electrons

Magnesium has 2 valence electrons. So, "has 2 valence electrons" matches Mg.

Carbon (C)

Step1: Electron shells

Carbon has 2 electron shells. Beryllium (Be) also has 2 electron shells. So, "has the same number of electron shells as Beryllium" matches C.

Step2: Valence electrons

Carbon has 4 valence electrons. So, "has 4 valence electrons" matches C.

Step3: Reactivity

Carbon is less reactive than Aluminum. So, "less reactive than Aluminum" matches C.

Answer:

• Magnesium (Mg): has the same number of electron shells as Silicon, more reactive than Boron, has 2 valence electrons.
• Carbon (C): has the same number of electron shells as Beryllium, has 4 valence electrons, less reactive than Aluminum.