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phy. ch. 17

vocab and questions

Answer Question
atoms the smallest particle of an element that can be identified with that element are...
element a substance made of only one kind of atom is...
Brownian motion evidence that atoms exist, as it results from the motion of neighboring atoms and molecules is...
molecule the smallest particle of substance consisting of 2 or more atoms of the same or different elements bonded together is...
compound a chemical substance made of atoms of 2 or more different elements combined in a fixed proportion is...
chemical formula a description that uses numbers and symbols of elements is...
nucleons the principal building block of the nucleus (protons/neutrons) are...
neutrons an electrically neutral particle that is one of the 2 kinds of particles found in the nucleus of an atom are...
protons a positively charged partical in the nucleus are...
isotopes atoms of the same element having different numbers of neutrons are...
atomic number the number of protons in the nucleus is...
ion what an atom is called when the number of electrons is more or less than the number of protons in the atom is... (atom = net charge, no longer neutral)
shell model of the atom model where electrons are grouped in concentric shells around the nucleus is...
periodic table chart that lists elements by atomic number and by electron arrangements is...
plasma a 4th phase in matter is...
nucleus the positively charged center of the atom is...
protons and neutrons mass number =...
number of electrons number of protons =...
the number of protons in the nucleus atomic number =...
fusion... in stars What forms heavier elements and where?
in your body Atoms __________ have been around since long before the solar system came into existence, more than 4.6 billion years ago.
neighboring atoms and molecules Brownian motion is evidence that atoms exist, as it results from the motion of ___________________. They bump into the larger particles we can see.
Atoms of same or different elements What are molecules made up of?
millions of atoms Complex molecules are made up of...
in the nucleus Where is most of the mass of atom located?
1st-2 2nd-8 outer shell- no more than 8 How many electrons can be held in each orbital?
the atoms physical and chemical properties What does the arrangement of electrons in the shells dictate?
bonding the attraction between protons and electrons that can cause atoms to combine
covalent bonds form when two atoms share electrons
ionic bonds form when electrons are transferred between atoms
gases atoms move the fastest in...
liquids atoms move faster in...
solids atoms move slowest in...
matter was made of atoms John Dalton studied chemical reactions ans said that...
the number of outer electrons in the periodic table, groups (columns) show...
the number of electron shells in the periodic table, periods (rows) show...
Created by: 14_ezilchUA on 2010-09-21



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