Predict the empirical formula of the ionic compound that forms from aluminum and oxygen.

For each element, predict where the "jump " occurs for successive ionization energies. (For example, does the jump occur between the first and second ionization energies, the second and third, or the third and fourth?) a. Be, b. N, c. O, d. Li.

Which set of quantum numbers cannot specify an orbital? a. n = 2, l = 1, m$_1$ = - 1 b. n = 3, l = 2, m$_1$ = 0, c. n = 3, l = 3, m$_1$ = 2 d. n = 4, l = 3, m$_1$ = 0

Which statements about subatomic particles are true? a. If an atom has an equal number of protons and electrons, it will be charge-neutral. b. Electrons are attracted to protons. c. Electrons are much lighter than neutrons. d. Protons have twice the mass of neutrons.

A chemist in an imaginary universe, where electrons have a different charge than they do in our universe, performs the Millikan oil drop experiment to measure the electron's charge. The charges of several drops are recorded here. What is the charge of the electron in this imaginary universe? $$ \begin{matrix} \text{Drop #} & \text{Charge}\\ \text{A} & \ {-6.9 \times 10^{-19} \mathrm{C}}\\ \text{B} & \ {-9.2 \times 10^{-19} \mathrm{C}}\\ \text{C} & \ {-11.5 \times 10^{-19} \mathrm{C}}\\ \text{D} & \ {-4.6 \times 10^{-19} \mathrm{C}}\\ \end{matrix} $$

What defines an element?

A chemist in an imaginary universe, where electrons have a different charge than they do in our universe, performs the Millikan oil drop experiment to measure the electron's charge. The charges of several drops are recorded here. What is the charge of the electron in this imaginary universe? $$ \begin{matrix} \text{Drop #} & \text{Charge}\\ \text{A} & \ {-6.9 \times 10^{-19} \mathrm{C}}\\ \text{B} & \ {-9.2 \times 10^{-19} \mathrm{C}}\\ \text{C} & \ {-11.5 \times 10^{-19} \mathrm{C}}\\ \text{D} & \ {-4.6 \times 10^{-19} \mathrm{C}}\\ \end{matrix} $$

What defines an element?

Which elements have the most similar chemical properties? (1) K and Na (2) K and Cl (3) K and Ca (4) K and S

how to convert this dimensional analysis 7.68 cal/sec to Kcal/min

Provide the present tense forms of estar. Tú _____ en el laboratorio.

Use the trigonometric forms of $z$ and $\overline{z}$ in Exercise $126$ to find $z\overline{z}\neq0$.

Briefly describe the appearance of the metamorphic rock gneiss and explain how it forms.

Provide the present tense forms of estar. José _____ en la biblioteca.