Electrons
Chemical Bonding
Covalent Bonding
Ionic Bonding
Mystery
100
What charge does an electron have?
Electrons have a negative charge.
100
What is chemical bonding?
The combining of atoms to form molecules or ionic compounds.
100
What is a covalent bond?
A bond that is formed when atoms share one or more pairs of electrons.
100
What is an ionic bond?
The attractive force between oppositely charged ions which form when electrons are transferred from one atom to another.
100
What happens when an atom absorbs energy?
When an atom absorbs energy the electrons orbiting that atom move into a higher energy orbit. In this way the energy is stored until it is later released causing the electrons to return to a lower energy orbit.
200
What are valence electrons?
An electron that is found in the outermost shell of an atom and that determines the atom's chemical properties.
200
What are three types of chemical bonding?
Covalent bond, ionic bond, and metallic bond.
200
Atoms are held together by a ______ bond.
metallic
200
How do you make a positive and negative ion?
To make a positive ion, you subtract electrons. To make negative ions, you add electrons.
200
What Is the Difference Between an Ionic and Covalent Chemical Bond?
A molecule or compound is made when two or more atoms form a chemical bond, linking them together. The two types of bonds are ionic bonds and covalent bonds. In an ionic bond, the atoms are bound together by the attraction between oppositely-charged ions. For example, sodium and chloride form an ionic bond, to make NaCl, or table salt. In a covalent bond, the atoms are bound by shared electrons.
300
How many valence electrons does oxygen have?
Oxygen has 6 valence electrons.
300
True or False? When two completely different elements bond, do they make a completely new substance?
True.
300
True or False? Molecules only exist when another molecule is present and retain half of the substances chemical properties. If False, explain why.
False. It can exist by itself and retain all of the substances chemical properties.
300
What are the properties of ionic bonds?
They have a strong bond, hard and brittle, and they have high melting points.
300
What charge does an atom have when it has more electrons than protons?
The electrons are negatively charged, so an atom with "extra" electrons will have a negative charge. And just so you know, any charged atom is an ion, and will have a specific ionic charge, like -1, -2, or +1, +2.
400
How do you find the number of valence electrons in groups 13-18?
You subtract 10 from the group number.
400
Which group on the periodic table rarely makes bonds?
Group 18: Noble Gases
400
What is a molecule?
A group of atoms that are held together by chemical forces; a molecule is the smallest unit of matter that can exit by itself and retain all of a substances chemical properties.
400
Why is crystal lattice made?
So that positive ions are nearest to negative ions.
400
Why don't metals form covalent bonds?
The electronegativity differences between metals and nonmetals are so great that instead of sharing electrons, they will completely transfer electrons from the metal to the nonmetal, forming positively and negatively charged ions.
500
How many valence electrons does magnesium have?
Magnesium has 2 valence electrons.
500
What two elements make salt?
Sodium and chlorine make salt.
500
When do covalent bonds form?
When atoms share electrons.
500
What is calcium carbonate?
It is a group of atoms bonded together by ionic bonds.
500
What is an atom with a extra electron?
An ion with a charge of 1-. An anion
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