Science Reviewer

Choose which rule the following suggests: Gold and Iron both are metals but differ in properties such as color and luster.

Atoms CAN be destroyed in chemical reactions.

Cells: [blank_start]Atoms[blank_end] ; Tissue: Matter

Each element has a unique average mass; however, what is shown on the Periodic Table is the atomic mass not the average

Cathode Rays have identical properties regardless of the element used

(Rutherford's Gold Foil Experiment)The partcles shot by the emitter were alpha or positive particles

Conclusions of Rutherford's Gold Foil Experiment

[blank_start]Protons[blank_end], which have a positive charge, and Neutrons, which have a [blank_start]neutral[blank_end] charge, contribute majorly to the mass of the atom while electrons does [blank_start]virtually [blank_end]nothing to the mass.

The nucleus with the nuclear binding force, holds the nucleus together

Number of [blank_start]protons[blank_end] + Number of [blank_start]neutrons[blank_end] = Mass Number

Number of [blank_start]protons[blank_end] equal to the atomic number which is [blank_start]unique[blank_end] to each element

A = ? Z = ? X = ?

Mass number = Atomic Weight found in the Periodic Table of Eements

Isotopes ; Ions

An atom with the number of electrons not equal to the number of protons is an ion

To calculate for the [blank_start]average atomic mass[blank_end], you need to multiply each of the atomic masses of each [blank_start]isotope[blank_end] with its respective [blank_start]fractional[blank_end] abundance which you will need to [blank_start]add[blank_end]. The sum is the average atomic mass of the element.

To calculate for the fractional abundance, you will need to multiply the %abundance by 100

Formula for Neutron