1. What is the charge of the nucleus of an atom?

• positive

• neutral

• negative

• zero

Configure the electrons of oxygen.(Oxygen= 8 e-)

• 1.6.1

• 2.6

• 2.5

• 2.7

What is the mass number of the atom?

Protons=8, Neutrons=9

• 8

• 9

• 17

• 1

The proton number of Actinium is 89, its neutron is 139, what is its atomic number?

• 89

• 136

• 225

• 227

Scientist who arranged the periodic table of elements?

• Dimitri Mendeleev

• Robert Boyle

• Isaac Newton

• Science teacher

They are all radioactive metals and most of them are made artificially.

• actinides

• lanthanides

• metals

• non-metals

These elements like Si, Ge, As are examples of what group?

• metals

• non-metals

• metalloids

• all of the above

This is the only liquid metal is of the periodic table.

• Bromine

• Tungsten

• Mercury

• Metalloid

Atoms that gain electrons become...

• negatively charged

• positively charged

• remain neutrally charged

• nucleus

What characteristics are shared by all alkali metals and alkaline earth metals?

• They conduct electricity very well.

• They are strong and shiny.

• They form alkaline solutions when mixed with water.

• They do not react with water at all.