1
Which subatomic particle is considered "massless" because it is so small?
Electrons
The First Known Element
Copper
What elements are in salt?
Sodium (Na) and Chlorine (Cl)
What do elements in the same period have in common with each other?
They all have the same number of electron orbitals/shells
Which family does Hydrogen belong to?
Nonmetals
Where are electrons located within an atom?
Outside the nucleus in orbitals/shells
Will all elements turn into（#########）
iron
There's a element do not have volume named(#########)
All elements have volume
Which family contains the most elements?
Transition Metals
The most dangerous element
Plutonium
Which subatomic particle has a negative charge?
Electrons
Which element has no neutrons?
Hydrogen (H)
Do all elements have weight?
yes
the heaviest element and one of the dangerous element
Oganesson
A mystery atom is the lightest of all the halogens. What element is it?
Fluorine (Halogens = column 17 and "lightest" means lowest mass)