Chapter 4

proton

Neutron

Electron

The primary substances of which all other things are composed are ________. A) molecules B) compounds C) elements D) electrons E) protons

Au is the symbol for ________. A) gold B) silver C) argon D) aluminum E) sodium

3) aluminum A) Al B) Am C) Au D) Sn E) Ag

What elements are in hydroxyapatite, OH, a major compound in human bones and teeth? A) carbon, potassium, oxygen, hydrogen B) calcium, phosphorous, oxygen, hydrogen C) carbon, phosphorous, oxygen, helium D) calcium, phosphorous, oxygen, helium E) carbon, potassium, oxygen, helium

Horizontal row in a periodic table

Vertical columns in a periodic table

Group 8A

Which of the following elements is a metal? A) nitrogen B) fluorine C) argon D) strontium E) phosphorus

Which of the following elements is a nonmetal? A) nitrogen B) sodium C) iron D) silver E) calcium

Which of the following elements is a metalloid? A) nitrogen B) lithium C) iron D) gold E) silicon

The elements sodium, magnesium, and silicon ________. A) are isotopes of each other B) are in the same period of elements C) have the same number of neutrons D) are in the same group E) have the same mass number

Atom

Like charges does what

Opposite charge does what

nucleus

amu

The smallest particle of an element that retains the characteristics of the element is a(n) ________. A) electron B) neutron C) proton D) atom E) nucleus

According to the atomic theory, ________. A) all atoms are different B) atoms are neither created nor destroyed during a chemical reaction C) atoms of the same element combine to form compounds D) all matter is made up of tiny particles called electrons E) a compound can contain different numbers of atoms as long as it has the same kinds of atoms

Which of the following descriptions of a subatomic particle is correct? A) A proton has a positive charge and a mass of approximately 1 amu. B) An electron has a negative charge and a mass of approximately 1 amu. C) A neutron has no charge and its mass is negligible. D) A proton has a positive charge and a negligible mass. E) A neutron has a positive charge and a mass of approximately 1 amu.

In an atom, the nucleus contains ________. A) an equal number of protons and electrons B) all the protons and neutrons C) all the protons and electrons D) only neutrons E) only protons

The atomic number is equal to the number of

The number of neutrons in an atom is equal to ________.

the number of electrons in a neutral atom

What is the mass number of an atom of potassium that has 20 neutrons? A) 15 B) 19 C) 35 D) 39 E) 59

Consider a neutral atom with 30 protons and 34 neutrons. The atomic number of the element is ________. A) 30 B) 32 C) 34 D) 64 E) 94

Consider a neutral atom with 30 protons and 34 neutrons. The mass number for this atom is ________. A) 30 B) 32 C) 34 D) 64 E) 94

Find the average atomic mass

Consider a neutral atom with 30 protons and 34 neutrons. The number of electrons in this atom is ________. A) 30 B) 32 C) 34 D) 64 E) 94

Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of 118/50Sn? A) 118 protons, 50 neutrons, 118 electrons B) 118 protons, 118 neutrons, 50 electrons C) 50 protons, 68 neutrons, 50 electrons D) 68 protons, 68 neutrons, 50 electrons E) 50 protons, 50 neutrons, 50 electrons

Isotopes are atoms of the same element that have ________. A) different atomic numbers B) the same atomic numbers but different numbers of protons C) the same atomic numbers but different numbers of electrons D) the same atomic number but different numbers of neutrons E) the same atomic mass but different numbers of protons

43) The correct symbol for the isotope of potassium with 22 neutrons is ________. A) 41/19 K B) 19/41 K C) 37/15 P D) 15/37 P E) 22/19 K

45) A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 makes up 75.8% of the sample, and the isotope Cl-37 makes up 24.3% of the sample. Which of the following statements is true? A) The atomic mass of chlorine will be less than 35. B) The atomic mass of chlorine will be more than 37. C) You cannot tell what the atomic mass will be. D) The atomic mass will be between 35 and 37. E) The atomic mass will be 24.3

Which of the following is not true for the atoms 13N, 14N, and 15N? A) They all have the same mass number. B) They are isotopes. C) They all have the same atomic number. D) They all have 7 protons. E) They all have 7 electrons.

isotopes

An atom can gain or