Chapter 16 Pretest

Elements on the far right of the periodic table are classified as ___________.

• nonmetals
• metalloids
• metals
• transition metals

The closer an electron is to the nucleus, the _________. 

• lower its energy 
• higher its energy
• greater the number of electrons
• fewer neutrons it contains

Every atom of the same element has the same ________. 

• atomic number
• number of electrons
• number of neutrons
• number of electrons and protons

For an atom to be neutral, the number of protons must equal the number of __________.

• electrons
• neutrons
• number of energy levels
• neutrons + electrons

The central core of an atom is called the ______.

• nucleus
• hub
• electron cloud
• core

The mass of a(n) _________is about equal to the mass of a proton. 

• neutron
• electron
• quark
• neutrino

Elements arranged in vertical columns in the periodic table are called _________.

• groups 
• periods
• rows
• columns

The region around the nucleus occupied by the electrons is called the _________________.

• electron cloud
• negative zone
• quark zone
• hub zone

The maximum number of electrons in the second energy level of an atom is ____________________.

• 8
• 4
• 2
• 5

Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two ________

• neutrons
• protons
• electrons
• neutrinos