Review for Chapter 4 TESTDevelopment of Atomic Theory.Group competition:

The group with the most correct answers wins 5 e.c. points to add to

their test grade. 1st runner up will receive 2 e.c.

points.

List the postulates of Dalton’s Atomic Theory.

Elements are made of tiny particles called atoms.

All atoms of a given element are identical. All atoms of a given element are different

from the atoms of other elements. Atoms can combine with each other(in

small whole number ratios) to form different compounds. (ex: NO, NO2, N2O)

Atoms are indivisible.

Which of Dalton’s postulates had to be changed?

All atoms of a given element are identical.

Atoms are indivisible.

Whose experiment first proved that atoms were divisible?

JJ Thomson

What discovery led to the change from all atoms of the same element are identical, to all atoms of the same element are chemically identical?

The discovery of isotopes.

What are isotopes?

Atoms of the same element with different numbers of neutrons.

They have different masses, but the same chemical properties.

If an element has an atomic number of 29, which element is it?

Cu

If an element has 13 protons, list its atomic number and symbol

Atomic number 13, Al

If an element has 6 protons and 7 neutrons, what isotope is it?

C-13

Which law does this illustrate? Who discovered it?

The Law of Conservation of Matter, discoveredby Lavoisier.

Which law does this illustrate? The Law of Multiple proportions.

Which law does this illustrate?

The Law of Definite proportions, discoveredby Proust.

These are six water molecules:Each has one oxygen and two hydrogenatoms. Each has a mass ratio of 8:1 oxygen to hydrogen

Which of the above = number of protons?Atomic number: 8

What does this picture illustrate?The three isotopes of hydrogen have the samenumber of protons and electrons, but varyingnumbers of neutrons. The electrons are locatedoutside of the nucleus, protons and neutrons arelocated inside the nucleus.

What are the nuclear particles?

Protons (p+) Neutrons (no)

What is the mass of hafnium if, out of every 100 atoms 5 have mass of 176 amu, 19 have mass of 177 amu, 27 have mass of 178 amu, 14 have mass of 179 amu, and 35 have mass of 180.0 amu?

5/100 (176 amu) = 8.80 amu 19/100(177 amu)= 33.6 amu 27/100(178 amu)= 48.1 amu 14/100(179 amu)=25.1 amu 35/100(180 amu)=63.0 amu The sum = average atomic mass Average atomic mass = 178.6 atomic mass units

Isotope Atomic number

Number of protons

Number of electrons

Mass number

H-1

H-2

C-13

P-32

Fill in the chart.

Isotopes

Isotope Atomic number

Number of protons

Number of electrons

Mass number

H-1 1 1 1 1

H-2 1 1 1 2

C-13 6 1 1 3

P-32 15 15 15 32

Fill in the Chart

Isotope Atomic #

# protons

# neutron

Mass number

gallium-61

Germanium-62

Germanium-63

Bromine-69

Fill in the Chart.

Isotope Atomic number

Number of protons

Number of neutrons

Mass number

gallium-61 31 31 30 61

Germanium-62

32 32 30 32

Germanium-63

32 32 31 63

Bromine-69 35 35 34 69

If this is carbon, which color represents the protons? (black, blue, yellow, orange,or transparent green.)

If this is carbon, which color represents the nucleus? (black, blue, yellow, orange,or transparent green.)

If this is carbon, which color represents the electrons? (black, blue, yellow, orange,or transparent green.)

The End

Add up your points.

The two teams with the most points turn in their cards for the extra credit on the test.