Describe the relationship between the number of valence electrons and the chemical properties of atoms.

How many protons, neutrons, and electrons are there in a neutral atom of $^{55}$Fe?

Explain why some atoms gain or lose electrons to form ions.

Match the phrase with a vocabulary word. a bond formed from shared electrons

Explain how the number of electrons in an energy level affects bond formation.

How many electrons are present in each of the following ions?

$$\mathrm{Rb}^{+}$$

How many $4d$ electrons are found in the following elements?

a. yttrium, $Z=39$

Light with a frequency of $1.14 \times 10^{15} \mathrm{~Hz}$ ejects electrons from the surface of sodium, which has a work function of $2.28~ \mathrm{eV}$. What is the minimum de Broglie wavelength of the ejected electrons?

In an electric circuit, where do the electrons come from that flow in the circuit?

Fill in the blank with the appropriate numbers for both electrons and bonds (considering that single bo nds are counted as one, double bonds as two, and triple bonds as three). Fluorine has __ valence electrons and makes ___ bond(s) in compounds.

How many electrons are present in each of the following ions?

$$\mathrm{Br}^{-}$$

The ways in which electrons are arranged into orbitals around the nuclei of atoms are called ______.

How many electrons are shared by two atoms that form a triple bond?

How many valence electrons does each carbon atom have?