Last Science Quiz Of The Year Flashcards
When electrons lose or gain electrons it changes the overall _________.
Charge
Atoms that lose ____________ become ions with a positive charge.
Valence electrons
Metal atoms, such as _____, become more stable when they lose valence electrons and form a chemical bond with a ________.
Sodium
Nonmetal
Why are atoms electrically neutral?
They have the same number of protons and electrons.
What happens when an atom gains or loses electrons?
It becomes a charged ion.
The attraction between positively and negatively charged ion in an ionic compound is an _______.
Ionic bound
A _________ is a bond formed when many metal atoms share their pooled valence electrons.
Metallic bond
A what surrounds the positive ions?
Sea of electrons
Why are metals good conductors of thermal energy and electricity?
Because the valence electrons can move from ion to ion.
What makes metal malleable?
Metal ions can slide past one another in the electron sea and move to a new position.
A _________ is a substance made up of two or more different elements.
Compound
What are compounds?
Chemical combinations of different types of atoms.
What do chemical bonds do?
They join atoms together.
A ___________ is a chemical bond formed when two atoms share on or more pairs of valence electrons.
Covalent bond
A computed formed from many covalent bonds is called a what?
Covalent compound
