An atom's electron configuration ends with 2s1. If another atom has 10 more electrons, what would be the continuation of the electron configuration?(5 points) Group of answer choices

4s2

3p1

3p3

3d5

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

Which element would mostly likely have an electron affinity measuring closest to zero