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- author "Flako"
- tags "Biology"
- description "Notes from Biology for EOC test"
- fileName "Chemistry"
- freezingBlueDBID -1.0
- Everything in the universe is composed of...
Anything that occupies space oe has mass
An element is...
A pure substance that cannot be broken down chemically into simpler kinds of matter
There are more than ______ elements
90% of mass of an organism is composed of 4 elements, what were they?
Oxygen, carbon, hydrogen, & nitrogen
The simplest particles of an element that retains all the properties of that element
What consist of an atom?
Protons, Neutrons, and Electrons
- - central core
- - consists of positive (+) charged protons & neutral neutrons
- - positively charged
- - contains most of the mass of the atom
All atoms have the same number of...
Number of protons called...
The atomic number
Number of electrons is...
balanced by an equal # of electrons
Number of neutrons varies slightly among..
Atoms of the same element
Protons and Neutrons have a mass of...
1 amu (atomic mass unit)
Atomic mass =
Protons and Neutrons
Negatively charged high energy particles with little or no mass
How many energy levels dotes an atom have?
The levels are
K (closest to nucleus), L, M, N, O, P, Q (farthest to nucleus)
Level K can only hold ___ ; Levels L to Q can hold ____
2 ; 8