For each of the following species, give the total number of electrons, the number of electrons in the valence shell, and the number of core electrons.   Species Number of electrons Number of electronsin valence shell Number of core electrons Sb       Na+       Br-

When sodium reacts with chlorine to form an ionic compound, each metal atom loses _____ electron(s) and each nonmetal atom gains _____  electron(s).   There must be ___(1,2,3) sodium atom(s) for every ___ (1,2,3) chlorine atom(s) in the reaction.

In the electron configuration shown below, how many valence electrons are there? 1s²2s²2p63s²3p4 O 10 16 4 2

A monatomic ion with a charge of -2 has an electronic configuration of 1s22s22p63s23p64s23d104p65s24d105p6.This ion is a(n) _______cation anion.What is the chemical symbol of the noble gas this ion is isoelectronic with? Xe.What is the formula of the ion? Ba2+.

An atomic cation with a charge of +1 has the following electron configuration: [He] 2s²2p5 What is the chemical symbol for the ion? ☐ How many electrons does the ion have? How many 2s electrons are in the ion? ☐ П

For each atom in the table below, write down the subshell from which an electron would have to be removed to make a +1 cation, and the subshell to which an electron would have to be added to make a -1 anion. The first row has been completed for you. atom H Ca Zn I subshell from which electron removed to form +1 cation 1s 0 0 subshell to which electron added to form -1 anion x 1s 0

Determine the number of valence electrons for each of the following atoms. Enter each answer as a numeral. For example, if an atom has two valence electrons, enter the numeral 2. а) Вe b) Al с) О d) Ar

What charge ion do you expect nitrogen to become when it gains or loses electrons? +2 O +3 -2 O-1 -3 +1

Predict the most stable ion of mercury O 2- O 3+ 1+ It is a Type II metal and would have more than one charge 2+