+

Chapter 3 Test Review

+

Which of the following are ions and which are atoms?Ca2+

KRnO2-

Ions – Ca2+ O2-

Atoms – K Rn

+

What are the different isotopes of hydrogen called?

Hydrogen, Dueterium, Tritium

+

What are the different types of radiation and their symbols?

Alpha 4 He Beta 0 e-

Gamma 0 Y 2 -1

0

+

Which subatomic particles have a charge?

Protons – positiveElectrons - negative

+

What did JJ Thomson study and discover?

Electrons – because the cathode ray moved towards the positive node

+

What did Rutherford study and discover?

He discovered positive protons in the nucleus

+

What was James Chadwick’s contribution?

The neutron and its contribution to atomic mass

+

All atoms contain a unique number of ______________.

protons

+

Where would you find electrons?

Electron cloud – surrounding the nucleus

+

What is an isotope?

Atoms of the same element with different #’s or neutrons

+

Where do you find the radioactive elements?

After bismuth

+

What is found in the nucleus?

Protons and neutrons

+

What is an ion?

An atom that has gained or lost electrons – has a charge

+

A cation has a __________ charge.

Positive

+

Which form of radiation is stopped by clothing?

Alpha

+

Complete the chart

Atom # protons # electrons # neutrons

calcium 20 20 20

+

Write the chemical symbol for an ion with 35 protons and 36 electrons.

Br -1

+

Complete the chart:Symbol # proton # electron # neutron Atom or

ion

38 proton 36 electron

49 neutrons87 Sr +2

ion38

+

Write the alpha decay for:

223 Fr

87

4 He + 219 At2 85