Nuclear
Neutrons released in a fission reaction can strike other nuclei and cause a _____.
Chain reaction
A helium nucleus with two protons and two neutrons is called a _____.
Alpha particle
Elements that lie along the stair-step line of the periodic table are ____.
Metalloids
A family of elements that has two electrons in its outer energy level is the ____.
Alkaline earth metals
A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is ____.
56
Both a fusion reaction and a fission reaction _____.
Produce energy
Negatively charged particles emitted from a nucleus at a high speed are _____.
Beta particles
Where can the noble gases be found on the Periodic Table of Elements?
Group 18
The elements in Groups 3 through 12 of the periodic table are the ____.
Transition elements
A particle that moves around the nucleus is a(n) ____.
Electron
Thorium-234 has a half life of 24 days. If you started with a 100-g sample of thorium-234, how much would remain after 48 days?
25g
The most penetrating type of radiation is the _____.
Gamma ray
Three transition elements in Group 12 of the periodic table are ____.
Zinc, Cadmium, Mercury
When hydrogen reacts with the active metals, it forms a chemical bond by ____.
Losing one electron
Atoms of the same element with different numbers of neutrons are called ____.
Isotopes
The three types of nuclear radiation in increasing order of penetrating power are _____.
Alpha, beta, gamma
Why do the noble gases NOT form compounds readily?
Their outer energy levels are completely filled with electrons
The only metal that is a liquid at room temperature is ____.
Mercury
Hydrogen is grouped with the alkali metals because it ____.
Has one electron in its outer energy level
Dot diagrams are used to represent ____.
Outer level electrons
The process by which nuclei having low masses are united to form nuclei with larger masses is _____.
Fusion
A family of elements that contains the most reactive metals is the ____.
Alkali metals
Bromine is the only halogen and nonmetal that is normally a ____.
Liquid
An allotrope of carbon that is hard and is often used in jewelry is ____.
Diamond
A chemical symbol represents the ____ of an element.
Name