Chapter 11

Which contains more atoms: 1 kg of lead or 1kg of aluminum?

1 kg of aluminum lower atomic weight is more atoms

How many individual atoms are in a water molecule?

3

The periodic table of the elements is a list of _______.

Atoms

Which of the following are negatively charged?

Electrons

Which of these atoms has the largest number of neutrons in the nucleus? Helium Gold Carbon Hydrogen

Gold

Brownian motion

Haphazard movement of tiny particles suspended in a gas or liquid resulting from bombardment by the fast-moving molecules of the gas or liquid.

Rank the number of shells in these noble-gas atoms from most to least: A. Xenon. B. Krypton. C. Helium. D. Neon.

Most - Xenon Krypton Neon Helium

Neutrons number is

Neutrons = Mass - atomic number

If no molecules in a body could escape, would the body have any odor?

No

What element results if two protons and two neutrons are ejected from a radium nucleus?

Radon

What is the number of orbiting electrons in each when the isotopes are electrically neutral?

cobalt-59, cobalt-60 = 27,27 electrons

The atomic masses of two isotopes of cobalt are 59 and 60. What is the number of protons in each? Express your answers as integers separated by a comma.

cobalt-59, cobalt-60 = 27,27 protons (a) Cobalt 59 has 32 neutrons and 27 protons Cobalt 60 has 32 neutrons and 28 protons (b) Cobalt 59 has 27 protons => 27 electrons Cobalt 60 has 28 protons => 28 electrons

What is the number of neutrons in each?

cobalt-59, cobalt-60 = 32,33 neutrons

To become a negative ion, does an atom lose or gain an electron?

gains

To become a positive ion, does an atom lose or gain an electron?

loses