Question

16 multiple choice 1 point an atom has 15 total electrons. how many valence electrons does it have? three four five six 17 multiple choice 1 point atom \a\ has seven electrons in its outer shell. atom \b\ has one electron in its outer shell. they react and bond. now, atom \a\ has eight electrons in its outer shell. what kind of bond has formed? covalent ionic metallic electron

Explanation:

Step1: Determine electron configuration for 15 - electron atom

The electron - configuration of an atom with 15 electrons is 1s²2s²2p⁶3s²3p³. The outermost shell is the third shell (n = 3), and the number of electrons in the third shell is 2 + 3=5. Valence electrons are in the outermost shell, so it has 5 valence electrons.

Step2: Identify bond type for atoms A and B

Atom A has 7 outer - shell electrons and atom B has 1 outer - shell electron. Atom B donates its outer - shell electron to atom A to complete the octet of atom A. This is characteristic of an ionic bond, where one atom donates electrons to another atom.

Answer:

1. C. Five
2. B. Ionic