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1

what is chemistry?

the study of makeup structure, properties of substances and the changes that occur to them. the study of matter.

2

what is atom?

smallest unit of any elemental substance that maintains the characteristics of that substance.

3

what make up an atom?

subatomic particles.

4

what does nucleus contain(central core of an atom)?

+change protons and neutrons-no charge.

5

where is -charged electrons?

spin around the nucleus in an orbital.

6

what is an element?

substance that contains only one kind of atom.

7

what determine the element of an atom?

the number of protons.

8

what are elements organized by?

structure and chemical properties in the periodic table.

9

what is a system of symbols used to?

identify elements.

10

what does Chart show?

how elements relate and react to one another.

11

what does each cell give?

the symbol of the chemical element and includes the atomic number and atomic mass.

12

what is atomic number?

number of protons in the nucleus in each atom of that element.

13

what is atomic mass?

sum of the masses of the protons and neutrons in an atom.

14

what does organization of the cell indicates?

how elements interact chemically.

15

how are elements are grouped?

metal(left)or nonmetals(right)

16

what are compounds?

substance in which 2 or more elements chemically combine

17

what is the basic unit of any compound?

molecule

18

what is table salt?

Na-Cl

19

what is chemical formula?

combination of symbols of elements making up a compound that represents one molecule or unit of a compound. Has the symbol and subscript numbers of atoms for each element in the compound.

20

what does- know how to read a chemical formula help?

identify the elements in the substance.
e.g. H20-->2 hydrogen and 1 oxygen atom.

21

what can chemistry formulas indicate?

how atoms are arranged in a molecule.

22

what does structural formula for carbon based compounds show?

how atoms connect to the carbons.

23

what is acetic acid chemical formula?

C2H4O2

24

what is acetic acid structural formula?

CH3COOH

25

what is chemical bond?

force that holds 2 atoms together.

26

what form bond?

electrons

27

how many e- does each orbital contain?

2

28

what is shell?

the space around the nucleus with one or more orbitals.

29

how many shells does atoms have(max)?

7

30

when are atoms most stable?

when outer shell is full of e-