Question

1) Know and understand the history of the development of the atomic theory (name the scientist and what they did)

2) State the Law of Consercation of Matter

3) State the Law of Constant Composition (aka Law of Definite Proportions)

a) Be able to calculate percent by mass

4) Name the three subatomic particles of atoms, and know the mass and charge of each particle.

5) Draw a diagram of Thomson's plum-pudding model of the atoms and explain why it has this name

6) Know and understand what alpha particles are and how they contributed to the development of Rutherford's model of the atom

a) draw a diagram of the Rutherford model of the atom and label the nucleus and the element

7) Know and understand how to find the atomic number and atomic mass of each element on the periodic

a) Be able to calculate the number of neutrons using the mass number and atomic number

b) Be able to write the atomic symbol

8) Know and understand what isotopes are and how they are different from each other.

a) Be able to write the full atomic symbol for any isotope

b) Be able to calculate the number of protons and neutrons when provided the full atomic symbol for any isotope

9) Know and understand what the atomic mass (aka atomic weight) of each element is

a) Know the units used for atomic mass

b) Be able to calculate the weighted average values for the atomic mass of an element

10) Know and understand the difference between a group and period in the periodic table

a) Be able to find the group number from the periodic table

11) Know the following sections of the periodic table:

a) Main group elements (representative)

b) Transition metals

c) Landthanides (rare earths)

d) Actinides

e) Metals

f) Nonmetals

g) Metalloids

h) Alkaline metals

i) Alkaline-earth metals

j) Chalcogens

k) Halogens

l) Noble gases

12) Know and understand what an ion is

a) Know and understand the difference between a cation and an anion

b) Know and understand how a cation and an anion are developed

c) Know and understand how to determine the number of protons, neutrons, and electrons for an ion when given the complete symbol of the ion

d) Know and understand how to write the complete symbol of the ion when given the number of protons, neutrons, and electrons for an ion.

Answer 1

4. Electrons, Protons and neutrons .10938356 × 10^-31 kilograms, proton mass1.6726219 × 10^-27 kilograms,

and neutron has a mass of 1.674927351(74)×10−27 kg 7.The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons.Atomic number is the number if protons or number of eletrosn, number of neutrons = mass number- atomic number 8. Isotopes are atoms of the same element having same mass number, but different atomic number' 9 indicates mass on atomic or molecular scale 1 amu = 1.66053904 × 10-27 kilograms 10. Elements in a group share a common number of valence electrons. Elements in a period share a highest unexcited electron energy level. . 11The main group is the group of elements whose lightest members are represented by helium,lithium, beryllium, boron, carbon, nitrogen,oxygen, and fluorine as arranged in theperiodic table of the elements 12. Cations are +vely charged while anoins are-vely charged. Removal of elctron gives positive charge and addition of electron gives negative charge 1. Aristotle belived that matter can be subdivided into particles withoutc change in properites.Dalton mentioned that matter consists of tiny particles called atoms and Thomson discovered electrons and nucleus was by Rutherford.

2. Matter can neither be created nor destroyed. It can be changed from one form to another

3. In any given chemical compound, the elements always combine in the same proportion with each other

5.