These two particles make up an atom's nucleus.
What are protons and neutrons?
There are this many elements in the periodic table.
What are 118?
This family or group reacts readily with group 1 alkali metals and are the most reactive of the non-metals.
What is halogens or group 17?
In an atom, this is where the electrons are found.
What is the electron cloud?
The smallest piece of matter that still has the properties of an element.
What is an atom?
This group or family is very stable because of their fully filled outer electron shell.
What is noble gases or group 18?
The left side of the periodic table are called this.
What are metals?
This is the neutrally charged subatomic particle.
What is the neutron?
The sum of protons and neutrons is called this.
What is the mass number or atomic mass?
The right side of the periodic table are called this.
What are nonmetals?
This subatomic particle determines the identity of the atom.
What is the proton?
The group number on the periodic table tells us this about the atom.
What are the number of electrons in the outermost shell?
This is the atomic number of Mg (Magnesium).
What is 12?
The mass of an electron is this fraction as compared to the mass of a proton or neutron.
What is 1/2000?
The period number on the periodic table tells us this about the atom.
What are the number of electron orbitals / shells?