Atomic Theory & Structure

Atomic Structure

100

This subatomic particle is neutral, or has no charge.

What is a neutron

200

The number of protons gives us this value, which is unique for each element and determines its identity.

What is the atomic number?

300

These two subatomic particles must be equal in number in order to make the atom neutral.

What are electrons & protons?

400

The two sub-atomic particles that make up the nucleus.

What are protons & neutrons?

500

This particle is 1/1837 the a mass of a proton

What is an electron?

History of the atom

100

electron, plum pudding, cathode ray tube

JJ Thomson

200

dense nucleus, mostly space, founded proton, gold foil experiment, alpha particles

Rutherford

300

first to term atoms, called them "atomos"

democritus

400

came up with a 5 postulate theory

dalton

500

electrons orbit a nucleus, like planets orbiting the sun; planetary model

bohr

Protons, Neutrons, & Electrons

100

helium

p - 2, n - 2, e - 2

200

Flourine

p - 9,n -10,e - 9

300

Phosphorus

p - 15, n - 16, e - 15

400

Chlorine - 37

p - 17,n - 20,e - 17

500

These are outer-shell electrons

What are valence?

Ions and Isotopes

100

F^1- (tell me protons, electrons, neutrons)

9p, 10e, 10n

200

¹⁵₇ N, tell me p, e, n

7p, 7e, 8n

300

How many electrons does ⁴⁵₂₇X^3- have

30e

400

tell me the number of protons, electrons, and neutrons in: ¹²₁₁X²⁺

11p, 9e, 1n

500

Calculate the atomic mass of silicon. The three silicon isotopes have atomic masses and relative abundances of 27.9769 amu (92.2297%), 28.9765 amu (4.6832%) and 29.9738 amu (3.0872%).

am = (27.9769 x 0.922297) + (28.9765 x 0.046832) + (29.9738 x 0.030872) = 25.8030 + 1.3570 + 0.9253 = 28.0853 amu

Miscellaneous

100

²¹⁹₈₆Rn --> ⁴₂ He + _______

Fill it in and tell me type of radiation

²¹⁵₈₄Po; alpha

200

Which particle (alpha, beta, or gamma) is blocked the easiest? (with paper)

alpha

300

This is why the atomic mass listed on the periodic table is not a whole number.

What is because it is the weighted average of all of the masses of the isotopes of a given element?

400

Which radioactive particle has no mass?

gamma

500

Calculate the average atomic mass for silicon based on the percent abundances of its naturally occurring isotopes: Si-28: 98% Si-29: 1.5% Si-30: 0.5%

What is 28.03