A particular atom contains 29 electrons, 34 neutrons, and 29 protons. What is the identity of this element, and what is its atomic number?

Refer to the periodic table inside the front cover and identify an element with atomic number greater than 50 that has properties similar to the element with atomic number 18

The mass numbers of two isotopes of cobalt are 59 and 60. (a) How many protons and how many neutrons are in each isotope? (b) How many orbiting electrons does an atom of each have when the atoms are electrically neutral?

If a potassium atom has an atomic number of 19 and a mass number of 39, how many protons, electrons, and neutrons are in the atom?

Organize the information on atomic mass to complete the outline. Atomic Mass A. Nucleus of atom 1. ______. 2. ______. 3. ______. B. Atomic mass unit 1. _______. 2. ______. 3. ______. C. Protons 1. ______. 2. ______. 3. ______. 4. ______. D. Mass number 1. ______. 2. ______.

Rank the numbers of shells in these noble-gas atoms from most to fewest: a. Argon b. Radon c. Helium d. Neon

The atomic masses of two isotopes of cobalt are 59 and 60. What is the number of protons in each?

Rank these noble-gas atoms by their number of filled shells, from least to most: (a) argon, (b) radon, $(c)$ helium, (d) neon.

Consider the following atoms: A. gold, B. copper, C. carbon, and D. silver. Consult the periodic table and rank these atoms, from most to least, by their a. mass. b. number of electrons. c. number of protons.

Rank the masses of these molecules from greatest to least.

$\mathrm{O}_2$, $\mathrm{H}_2\mathrm{O}$, $\mathrm{CH}_4$ and $\mathrm{NH}_3$.

Consult the periodic table and rank these atoms, from most to least, by their mass. Rank from most to least. To rank items as equivalent, overlap them

Silver
Copper
Carbon
Gold

Why does all the water in a lake have to be cooled to $4^{\circ} \mathrm{C}$ before the surface water can be cooled below $4^{\circ} \mathrm{C}$ ?

What is the density $(\mathrm{g} / \mathrm{mL})$ of the following sample? A 20.0-mL sample of a salt solution that has a mass of 24.0 g.

Suppose you balance a 2-kg ball on the tip of your finger, which has an area of 1 cm2. Show that the pressure on your finger is 20 N/cm2, or is 200 kPa.