Take out reading check andDo Now:. 0.0000001 cm. 1. If 100,000,000 copper atoms were placed side by side, they would form a line 1 cm long. A)What is the number of atoms written in scientific notation. B)What is the diameter of 1 copper atom?. So how small is the atom?. Very small!
1. If 100,000,000 copper atoms were placed side by side, they would form a line 1 cm long. A)What is the number of atoms written in scientific notation.
B)What is the diameter of 1 copper atom?
Proposed Law of Conservation of Matter - matter cannot be created nor destroyed
Proposed Law of Definite Composition - a given compound always contains the same elements in the same proportions by mass
The atoms of any one element differ from those of any other element.
+ - +
- + - +
+ - +
- + -
~ 9.1 x 10-28 g
1. Atoms mostly empty space
2. Atom contains a nucleus
3. Nucleus positively charged
Very small compared to proton
Outside nucleus, in energy levels (clouds)
99.9% of mass
the same, may
Try your best!!!
(must be provided)
= p - e
= p + n
(on periodic table)
= p (also e if not charged)
Becky earned the following quiz grades… 87, 56, 94, 88 and 80. What is her quiz average?
Becky’s HW average was a 55 and her test average was a 75. Her teacher based her overall class grade on the following percentages: HW is 20%, Quiz is 50%, and Test is 30%. What is her overall grade in this class?