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science questions

Chapter 17 questions

90 of the elements in the periodic table are ______. the others are man-made(synthetic) in labortories. occur naturally
What are the 5 most common things that make up living things? oxygen, carbon, hydrogen, nitrogen, and calcium
What is the lightest element in the periodic table? Hydrogen
Atoms moves fastest in... gases
Who had the first idea of atoms? the Greeks
Whats the Brownian Motion? its the constant jiggling of particles just large enough to be seen; evidence that atoms exsist from the motion or neighboring atoms and molecules. They bump into the larger particles we can see
What consists of two or more atoms that bond together by sharing electrons? molecules
Whats the difference between atoms and molecules? atoms are single pieces and molecules and two or more atoms
H2O is a ... compound
A substance that is made of atoms of different elements combined together is a... compound
What does a chemical formual show? it shows the symbols of elements presents and the number of atoms of each element
What kind of particles and their charges are nucleons? protons (positive) and neutrons (neutral)
What is the atomic number? the number of protons; how the elements are arragned on the periodic table
what is an example of an isotope? C-14, the most common is C-12
Isotopes have the __________ as a regular atom but a different ______________. atomic number; mass number
Isotopes have the same number of _______________ as a regualar atom and a different number of ___________________. protons; neutrons
What is the nucleus made of? (nucleons) protons neutrons
What charge does electrons have? negative charge
When an atom no longer has the same amount of protons and electrons, what does the atom become? an ion
How many electons can the 1 shell hold? 2 electrons
The second shell can hold up to ________ electrons 8
how many eletrons can the outer shell hold? no more than 8
What is a covalent bond? when 2 atoms share electrons from the outer shell; (co-share; valent- outershell)(connect together)
What is an ionic bond? when electrons are transferred between atoms; when the electrons transfer they become ions (give away and arent connected)
What does a column show on the periodic table? how many outer electrons that are the elements in that column... example...Li is in the first collumn so it has ONE electron on the outershell
What are the 3 most common phases of matter? solid, liquid, gas
What phase of matter only exsists in very very high temperatures? plasma
Where can plasma most commonly be found in the stars
freezing point 0 C
melting point 0 C
boiling point 100 C
Created by: tagne1
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