You could swallow a capsule of germanium, Ge (atomic number 32), without significant ill effects. If a proton were added to each germanium nucleus, however, you would not want to swallow the capsule because the germanium would (a) become arsenic. (b) become radioactive. (c) expand and likely lodge in your throat. (d) have a change in flavor.

Which are older, the atoms in the body of an elderly person, or those in the body of a baby?

The nucleus of an electrically neutral iron atom contains 26 protons. How many electrons does this iron atom have?

Which are older-the atoms in the body of an elderly person or the atoms in the body of a baby? (a) A baby’s atoms are older because this is surely a trick question. (b) An elderly person’s are older because they have been around much longer. (c) The atoms are the same age, which is appreciably older than the solar system. (d) The atoms’ ages depend on the person’s diet.

Someone argues that you shouldn’t drink tap water because it contains hundreds of molecules of some impurity in each glass. How would you respond in defense of the water’s purity, if it indeed does contain hundreds of molecules of some impurity per glass? (a) Impurities aren’t necessarily bad; in fact, they may be good for you. (b) The water contains water molecules, and each water molecule is pure. (c) There’s no defense. If the water contains impurities, it should not be drunk. (d) Relatively speaking, a hundred molecules is practically nothing.

How does the element iridium relate to the time of the extinction of the dinosaurs?

How many electrons are there in the third shell of sodium, Na (atomic number 11)? (a) None (b) One (c) Two (d) Three

If you remove two protons and two electrons from a sulfur atom $\ce{(S)}$, what new element is formed?

List the following atoms in order of increasing atomic size: thallium, Tl; germanium, Ge; tin, Sn; phosphorus, P. (a) Ge < P < Sn < Tl, (b) Tl < Sn < P < Ge, (c) Tl < Sn < Ge < P, (d) P < Ge < Sn < Tl.

When the isotope bismuth-213 emits an alpha particle, what new element results? (a) lead, (b) platinum, (c) polonium, (d) thallium.

What is the main difference between a conceptual model and a physical model?

Ethylene glycol (antifreeze) has a density of 1.11 $g/cm^3$. a. What is the massing of 417 mL of ethylene glycol? b. What is the volume in L of 4.1 kg of ethylene glycol?

Which are older—the atoms in the body of an elderly person or the atoms in the body of a baby? (a) A baby’s atoms are older because this is surely a trick question. (b) An elderly person’s are older because they have been around much longer. $(c)$ The atoms are the same age, which is appreciably older than the solar system. (d) The atoms’ ages depend on the person’s diet.

An atom has 43 electrons, 56 neutrons, and 43 protons. What is its approximate atomic mass? What is the name of this element?