Atoms and Periodic table

What is the Mass Number of an atom with 30 protons, 40 neutrons.

• 40

• 70

The center of an atom is called the __________

• Nucleus

• Valance

What Greek philosopher suggested that the universe was made of invisible units called atoms

• Democritus

• Fransisco

A nucleus of an atom contains what two parts?

• Protons and Neutrons

• Neutrons and Electrons

What are the elements called in Groups 3-12 of the periodic table?

• Alkai Metals

• Transitional Metals

• Noble Gases

Isotopes of an element have different number of ___________ and therefore have different masses.

• Proton

• Neutron

Electron in the outermost energy level are called?

• Valence Electron

• Valence Proton

• Valence Neutron

__________ are Group 1 metals and are soft and react with water

• Alkai Metals

• Transitional Metals

• Noble Gases

The majority of the elements in the periodic table are

• Non-Metals

• Metals

Elements in the same _________ have the same number of valence electrons.

• Period

• Group