Which one of the following species has an ion form which is not isoelectronic with others ion forms? O Sodium O Aluminum O Magnesium Oxygen O Chiorine

What is electron affinity?   energy change associated with the gaining of several of electrons required to complite the outermost orbital of the atom in the gaseous state energy change associated with the gaining of a proton by the atom in the gaseous state energy change associated with the gaining of several electrons to complete the outermost sublevel of the atom in the gaseous state energy change associated with the gaining of an electron by the atom in the gaseous state

What element has 10 electrons when it forms an anion with a 2−charge? The elemental symbol of this element is-

I need the answer as soon as possible

The effective nuclear charge (Zeff) felt by the outermost electrons is the strongest for which of the following elements? Si OS O Al OP

Use the periodic table to predict which ion will form from each main‑group element. Cs:   Br:   N:   Se:   Sr:

Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with the strontium ion, Sr2+.

Atom/Ion: S # Core Electrons # Valence Electrons Effective Nuclear Charge (Zeff)

For each element, identify the charge of its most common ion.  Br    Na   Se   Al   +2 −2 −3 +3 −1 +1

An atomic cation with a charge of +1 has the following electron configuration: 1s²2s²2p5 What is the chemical symbol for the ion? How many electrons does the ion have? How many 2p electrons are in the ion? 1 1 X