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SCIENCE CHAP 3 MATTER &CHANGE
Terms in this set (23)
The smallest particle of an element that retains all the properties of that element
Anything that has volume and mass
Natural or artificial substance that cannot be broken down into simpler substances by physical or chemical means
Positively charged center of an atom made up of protons and neutrons and surrounded by electrons and energy levels
Tiny atomic particle that has mass and a positive electric charge
Tiny atomic particle that is electrically neutral and has about the same mass as a proton
Tiny atomic particle with little mass in a negative to charge in atoms electrons are Equal in number to its protons and are located in a cloud like region surrounding the nucleus
Number of protons contained in a atoms nucleus
Combined number of protons and neutrons in the nucleus of an atom
An atom of an electron that has a different mass number than the element but the same chemical properties *same element diff # of neutrons
An atom that gains or loses an electron
Elements occur naturally on the earth and in the stars
The average of the mass numbers of the naturally occurring isotopes
Why would the atomic mass be stated as 35.453 if there's no such thing as a fraction of a neutron?
Electrons occupy areas called blank
The volume of the atom is mostly blank
2 - 8 - 18 - 32
How many atoms in levels 1 through 4 in each of the energy levels?
The electrons in the outermost energy level
What are valence electrons?
They are more reactive then the ones on the right
why are the elements on the far left of the periodic table of different from the elements on the right of the periodic table?
When the number of electrons balances the number of neutrons
When are atoms electrically neutral?
it loses its valence electron
How can an atom become a positive ion?
it gains an electron
How can an atom become a negative ion?
Hydrogen and helium
What are the two most abundant element in the universe?
Oxygen, silicon, aluminum, iron
What are the four most abundant elements in earths crust?
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