Alchemy

A group of elements that are catagorized by having one valance shell electron

• Noble Gasses

• Alkali Metals

• Alkaline Earth Metals

• Halogens

Calcium

• Has an atomic number of 21

• Has four electron shells

• Has nineteen protons

• Is a Alkali Metal

Calcium and Bromide

• Are in the same period

• Are in the same group

• Are both non-metals

• Are metals

Calcium has an average atomic mass (amu) of 40.08. This suggest that

• Calcium has one or more than one isotope

• Undergoes gamma decay

• Has a high density with respect to Scandium

• Has approximately 40 electrons

An element that is not an ion, has one electron in its outer valance shell and 12 neutrons is ____

• Calcium

• Sodium

• Bromide

• Argon

A Chloride ion has average atomic mass of 35, is a stable isotope, and a charge of -1. How many electrons does it have?

• 35

• 35

• 0

• 18

The symbol for Calcium is Ca. So Ca-45

• Has 45 neutrons

• Has 45 protons

• Has 45 electrons

• Has a mass of 45 amu

The first 92 elements in the periodic table are thought to be created by the process of ___

• Gamma decay

• Beta decay

• Fission

• Fusion

Strontium-90 undergoes beta-decay and has a half-life of 28.8 years. If I have a 1,000 grams sample that contains 28.8 grams of Strontium-90, Approximately how much Strontium-90 will I have in 90 years?

• 100 grams

• 28.8 milligrams

• 15 grams

• 3.5 grams

Calcium Ca-42 undergoes decay to Argon-40. What type of decay has it undergone?

• Alpha decay

• Beta decay

• Gamma decay

• Ionization