Chapter 16
The vertical columns in the periodic table are called
Groups
The mass number minus the atomic number equals the number of
Neutrons
Horizontal rows of the periodic table are called ___
Periods
The horizontal rows in the periodic table are called
Periods
Elements in groups 3 through 12 are called
Transition Elements
Every object in the universe is composed of atoms
True
Nonmetals are poor conductors of heat and electricity
True
The chart showing the classifications of elements according to their properties and increasing atomic numbers is called the periodic table
True
The identity of an element is determined by the number of protons
True
The sum of the number of protons and the number of neutrons in an atom is the mass number
True
The smallest piece of an element that still retains the properties of the element is a(n)
Atom
The ___ of an atom is the sum of the number of protons and the number of neutrons in the nucleus
Atomic mass
The number of protons in an atom is the
Atomic number
In the periodic table the elements are arranged by increasing ___ and by changes in physical and chemical properties
Atomic numbers
Each energy level of an atom has a maximum number of ___ it can hold
Electrons
The maximum number of electrons in the second energy level of an atom is 4
False: 8
The symbol for chlorine is C
False: Cl
The number of protons in an atom is called the atomic mass
False: atomic number
The region around the nucleus occupied by the electrons is called the negative zone
False: electron cloud
A diagram showing only the outer energy level electrons is call a(n) periodic table
False: electron dot diagram
Elements arranged in vertical columns in the periodic table are called periods
False: groups
The mass of an electron is about equal to the mass of a proton
False: neutron
Seven electrons in the outermost energy level is characteristic of a metal
False: nonmetal
The central core of an atom is called the hub
False: nucleus
A chemical symbol represents the ___ of the element
Name
Electrons have ___ charges
Negative
Neutrons have ___ charge
Neutral
Protons have ___ charges
Positive
The nucleus of an atom is ___ charged
Positively
A particle that moves around the nucleus is a(n)
Proton
A certain atom has 26 protons, 26 electrons, and 30 neutrons. It has a mass number of
56
