Write the names for the elements in each of the following formulas of compounds used in medicine:

c. Demerol, C₁₅H₂₂ClNO₂

Write the names for the elements in each of the following formulas of compounds used in medicine:

a. salt substitute, KCl

Identify the group or period number described by each of the following:

a. contains C, N, and O

Identify the group or period number described by each of the following:

b. begins with helium

Give the symbol of the element described by each of the following:

a. the alkaline earth metal in Period 2

Identify each of the following elements as a metal, a nonmetal, or a metalloid:

e. located in Group 8A (18)

Identify each of the following elements as a metal, a nonmetal, or a metalloid:

a. located in Group 2A (2)

Juan added the following elements to the soil to improve potato production. Identify the group and period for and classify each as an alkali metal, an alkaline earth metal, a transition element, or a nonmetal:

b. Cu

Identify each of the following as describing either a proton, a neutron, or an electron:

a. has the smallest mass

Is each of the following statements true or false?

c. Neutrons repel each other.

On a dry day, your hair flies apart when you brush it. How would you explain this?

Sometimes clothes cling together when removed from a dryer. What kinds of charges are on the clothes?

Would you use the atomic number, mass number, or both to determine each of the following?

c. number of particles in the nucleus

Would you use the atomic number, mass number, or both to determine each of the following?

d. number of electrons in a neutral atom

How many protons and electrons are there in a neutral atom of each of the following elements?

a. argon

Write the atomic symbol for the isotope with each of the following characteristics:

c. 25 electrons and 28 neutrons

Argon has three naturally occurring isotopes, with mass numbers 36, 38, and 40.

a. Write the atomic symbol for each of these atoms.

Argon has three naturally occurring isotopes, with mass numbers 36, 38, and 40.

b. How are these isotopes alike?

Argon has three naturally occurring isotopes, with mass numbers 36, 38, and 40.

c. How are they different?

Argon has three naturally occurring isotopes, with mass numbers 36, 38, and 40.

d. Why is the atomic mass of argon listed on the periodic table not a whole number?

Indium consists of two isotopes, ¹¹³₄₉In and ¹¹⁵₄₉In. If the atomic mass for indium on the periodic table is 114.8, are there more atoms of ¹¹³₄₉In or ¹¹⁵₄₉In in a sample of indium?

What is the group number and number of valence electrons for each of the following elements?

e. barium

Write the group number and draw the Lewis symbol for each of the following elements:

c. calcium

Write the group number and draw the Lewis symbol for each of the following elements:

e. gallium

Fill in the following blanks using larger or smaller, higher or lower. Mg has a _______ atomic size and a _______ ionization energy than Cs.

Complete each of the statements a to d using 1, 2, or 3:

1. decreases

2. increases

3. remains the same

Going down Group 6A (16),

d. the number of valence electrons _________

Complete each of the statements a to d using 1, 2, or 3:

1. decreases

2. increases

3. remains the same

Going from left to right across Period 4,

d. the number of valence electrons ________

Which statements completed with a to e will be true and which will be false?

An atom of N compared to an atom of Li has a larger (greater)

b. ionization energy

Which statements completed with a to e will be true and which will be false?

An atom of N compared to an atom of Li has a larger (greater)

c. number of protons

Use Rutherford's gold-foil experiment to answer each of the following:

b. How did the results differ from what he expected?