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Science Exam Vocab and People
Terms in this set (53)
The smallest unit of electric charge that is possible in ordinary matter; represented by the lowercase letter e.
a part that is made up of atoms, which contain protons, neutrons, and electrons.
A particle with an electric charge (-e) found inside of atoms but outside the nucleus.
The tiny core at the center of an atom containing most of the atom's mass and all of its positive charge.
Is made up of particles, which are protons, neutrons, and electrons, and form together to make an element.
A particle found in the nucleus with a positive charge exactly equal and opposite to the electron
A particle found in the nucleus with mass similar to the proton but with zero electric charge.
The number of protons in the nucleus of an atoms. The atomic number determines what element the atom represents.
Atoms of the same element that have different number of neutrons in the nucleus.
Mass number (atomic mass)
The number of protons plus the number of neutrons in the nucleus.
When an element is neutral, it is not positive or negative.
One of the discrete allowed energies for electrons in an atom
Characteristics of matter that can be seen through direct observation such as density, melting point, and boiling point.
Characteristics of mater that can only be observed when one substance changes into a different substance, such as iron into rust.
A chart that organizes the elements by their chemical properties and increasing atomic number
A row of the periodic table
A column of the periodic table
Elements that are typically shiny and good conductors of heat and electricity.
Elements that are poor conductors of heat and electricity.
AMU-atomic mass unit
A unit of mass equally to 1.66 x 10-24 grams, which is one twelfth the mass of the isotope carbon-12.
Elements in the first group of the periodic table.
Alkaline Earth Metals
Elements in the group containing helium. Neon, and argon, among others.
Elements in the group containing fluorine, chlorine, and bromine, among others.
Go least from greatest, from top to bottom.
A substance whose smallest particles include more than one element chemically bonded together
A substance that includes more than one type of element and/or compound that are not bonded together.
A bond formed between atoms through the sharing or transferring of electrons.
A type of chemical bond formed by shared electrons
A bond that transfers an electron from one atom to another resulting in attraction between oppositely charges ions.
A group of atoms held together by covalent bonds.
Electrons in the highest unfilled energy level of an atom. These electrons participate in chemical bonds.
Identifies that number and element of each type of atom in a compound. For example, the chemical formula Fe2O3 is for a compound with iron (Fe) and oxygen (O) is a ratio of two iron atoms for every three oxygen atoms
An atom that has an electric charge different from zero. Ions are created when atoms gain or lose electrons
Oxidation number (gaining or losing of electrons)
Indicates the charge of an atom when an electron is list, gained, or shared in a chemical bond. An oxidation number of +1 means an electron is lost, -1 means an electron is gained.
Found the particle and called it an atom thought they were uncuttable.
He disagreed with Democritus and said that atoms can be divided.
Proved that atoms are identical and are different for each element.
He discovered the electron and he discovered the isotopes.
Found out that the atomic mass is mostly in the nucleus. And he put electrons in a fixed orbit.
discovered the bohr model, electrons have orbiting electrons, and electrons have definite orbits.
Erwin Schrodinger and Werner Heisenberg
They discovered the electron cloud.
a process that rearranges chemical bonds to create new substances.
the substances that are combined and changed in the chemical reaction.
the new substances that result from a chemical reaction.
tells how many molecules are in a formula
an equation of chemical formulas that show the exact numbers of atoms and compounds in a chemical reaction.
tells how many atoms are in a formula
shows the reactants to the products
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