Atoms Flashcards
(20 cards)
At the core of each atom is a _______?
Nucleus
Nucleus is composed of ________ and _______ ?
Positively charged protons and uncharged neutrons
What is an atomic number?
The number of protons in the nucleus
What is the atomic mass?
The number of protons and neutrons combined
What is the atomic mass?
The number of protons and neutrons combined
What are molecules?
Particles of matter that are composed of one or more atom
What is matter?
Anything that occupies space and has mass
What is the smallest unit of matter?
Atom
What are atoms used for?
To build more complicated substances in the body
What is an element?
Pure substance made up of only one kind of atom
One example of a an element?
Oxygen
What is an element?
Pure substance made up of only one kind of atom
What are atoms composed of?
Protons, electrons, and neutrons
How many electrons can one orbital hold?
Only two
The ________ an orbital extends from the nucleus the ______ its energy level.
Farther, higher
What are electrolytes?
Compounds that form ions when dissolved in water
When does a covalent bond form?
When atoms share electrons
How is a atom neutral?
If their is one electron for every proton
Why is a chemical formula used?
To describe which atoms are present in a compound
When is a atom chemically stable?
When its outer energy level is full
When its energy shells have the maximum number of electrons they can hold
