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Elements
Periodic Table
Radioactive Elements
Chemical Bonds
Formulas & Properties of Compounds & Elements Due to Their Bonds
100
The smallest particle or unit that still can be considered an element.
What is an atom?
100
Creator of the first version of the periodic table.
Who is Dimitri Mendeleev? (men-duh-LAY-ef)
100
Each radioactive element has unstable forms known as _____________ _____________.
What are radioactive isotopes?
100
The force that forms chemical bonds.
What is the force of attraction (between subatomic particles of opposite electrical charge)?
100
In a chemical formula, this ion is written first.
What is a positively charged ion?
200
All atoms of a given element have the same number of these subatomic nuclear particles.
What is a proton?
200
The physical property of elements that was incorrectly used to base the construction of the periodic table, that also is the weighted average of all isotopes of an element.
What is the atomic mass?
200
Radioactive isotopes, like other isotopes, are identified by their mass number which is based on this formula.
What is the sum of the isotope's protons + neutrons?
200
These can be formed or broken when another atom, oppositely charged particle, or polarized group is nearby.
What are chemical bonds?
200
This schematic method of illustrating the valence electrons is used to show how and what type of chemical bonds are formed.
What is an electron dot diagram, also known as a Lewis dot structure?
300
The general name of the group of two or more atoms held together by chemical bonds.
What is a molecule?
300
The term for the number of protons that occur in every atom of an element?
What is the atomic number?
300
Unlike non-radioactive elements or non-radioactive isotopes, radioactive isotopes have unstable nuclei that decay, resulting in losing and/or gaining subatomic particles and losing energy, which causes this fundamental change in classification that cannot occur in chemical reactions.
What is the change in the identity of elements?
300
These particles are in an atom's highest energy shell, and can be donated to, received from, or shared with another or other atoms to form three types of chemical bonds.
What are electrons?
300
Molecular compounds are formed by this type of bond, so they generally have lower melting points and boiling points than ionic compounds and usually do not conduct electric current when melted or dissolved in water.
What is a covalent bond?
400
The different forms of an element due to differing numbers of neutrons.
What is an isotope?
400
The six naturally occurring elements in Group 18 that are usually nonreactive.
What are the noble gases?
400
This type of radiation is the most penetrating, most detrimental to living cells, and can be used to kill and stop the spread of cancer cells.
What is gamma radiation?
400
Metal atoms chemically react in this way, creating a type of bond, and this behavior generally decreases among metals from left to right across the periodic table.
What is losing valence electrons?
400
This is used in a chemical formula for any element that has more than one ion or atom involved in the bond and shows that the sum of charges is neutral or that each atom is stable.
What is a subscript?
500
The general area in which negatively charged particles are swiftly moving about the tiny, tiny, tiny nucleus.
What is the electron cloud?
500
The specific name of the most reactive group of metals in the periodic table, and the specific name of the most reactive group of nonmetals in the periodic table.
What are the alkali metals and what are the halogens?
500
This type of decay reduces the atomic number of the radioactive isotope by two.
What is alpha particle radiation or alpha decay?
500
These are the three different types of chemical bonds that have varying degrees of charge on the particles involved.
What are ionic bonds, polar covalent bonds, and nonpolar covalent bonds?
500
Negative single element ion and negative polyatomic ions exist, and are usually named by these conventional suffixes.
What is the suffix "-ide" for a negative single element ion, and the suffix "-ate" or "-ite" for negative polyatomic ions.