Nuclear
Energy
Nukes
Big Boom
Elements
100

Neutrons released in a fission reaction can strike other nuclei and cause a _____.

Chain reaction

100

A helium nucleus with two protons and two neutrons is called a _____.

Alpha particle

100

Elements that lie along the stair-step line of the periodic table are ____.

Metalloids

100

A family of elements that has two electrons in its outer energy level is the ____.

Alkaline earth metals

100

A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is ____.

56

200

Both a fusion reaction and a fission reaction _____.

Produce energy

200

Negatively charged particles emitted from a nucleus at a high speed are _____.

Beta particles

200

Where can the noble gases be found on the Periodic Table of Elements?

Group 18

200

The elements in Groups 3 through 12 of the periodic table are the ____.

Transition elements

200

A particle that moves around the nucleus is a(n) ____.

Electron

300

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

300

The most penetrating type of radiation is the _____.

Gamma ray

300

Three transition elements in Group 12 of the periodic table are ____.

Zinc, Cadmium, Mercury

300

When hydrogen reacts with the active metals, it forms a chemical bond by ____.

Losing one electron

300

Atoms of the same element with different numbers of neutrons are called ____.

Isotopes

400

The three types of nuclear radiation in increasing order of penetrating power are _____.

Alpha, beta, gamma

400

Why do the noble gases NOT form compounds readily?

Their outer energy levels are completely filled with electrons

400

The only metal that is a liquid at room temperature is ____.

Mercury

400

Hydrogen is grouped with the alkali metals because it ____.

Has one electron in its outer energy level

400

Dot diagrams are used to represent ____.

Outer level electrons

500

The process by which nuclei having low masses are united to form nuclei with larger masses is _____.

Fusion

500

A family of elements that contains the most reactive metals is the ____.

Alkali metals

500

Bromine is the only halogen and nonmetal that is normally a ____.

Liquid

500

An allotrope of carbon that is hard and is often used in jewelry is ____.

Diamond

500

A chemical symbol represents the ____ of an element.

Name

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