The Atom
Periodic Table of Elements
Bonding and Chemical Reactions
Reactions
Radioactivity
100

A particle with a positively charged nucleus surrounded by negatively charged electrons.

What is the atom?

100

Elements that are the most reactive are in this part of the table.

What is the lower left corner?

100

These are involved when atoms bond.

What are electrons?

100

The general name of any reaction that lets off heat.

What is an exothermic reaction?

100

Elements that have more than this many protons are radioactive.

What is 83?

200

In the nucleus of an atom, these two particles have nearly the same mass.

What are the proton and the neutron ?

200

This element has 88 electrons and 88 protons.

What is Radium?

200
The type of bond formed when electrons are shared between 2 atoms.
What is covalent?
200

An example of this type of chemical reaction is HCl + NaOH ---> NaCl + H2O

What it is acid-base?

200

This type of radioactive decay lets off 2 protons and 2 neutrons.

What is an alpha decay?

300

Electrons found in the outer most shell of an atom.

What are valence?

300
This element's atomic symbol is Au.

What is gold?

300

Nitrogen, a diatomic gas, has a very short, strong covalent bond between the two N atoms which involves this number of electrons.

What is 6?

300

This type of reaction occurs when two reactants combine to form one product: 2Mg + O2 --> 2MgO

What is synthesis?

300

A beta decay lets off this particle.

What is an electron (or positron)?

400

They are variants of a particular chemical element with the same number of protons but different number of neutrons.

What is an isotope?

400

Platinum is in this period and this group.

What are period 6 and group 10?

400

A ion that is negatively charged.

What is an anion?

400

This reaction occurs when a fuel reacts with oxygen releasing water and carbon dioxide.

What is combustion?

400

Polonium alpha decays to this element.

What is an lead?

500
The family in the periodic table that has seven electrons in its valence shell.
What are Halogens?
500

Elements in group 16 gain this many electrons in an ionic bond.

What is 2?

500

The formula of the ionic compound formed by potassium and nitrogen.

What is K3N?

500

This reaction occurs when two ionic solutions exchange their positive ions (cations) and negative ions (anions) to form two new compounds.

What is a double replacement?

500

A type of decay that lets off a ray but the protons and neutrons do not change.

What is a gamma decay?

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