Cada pergunta deste Quiz é cronometrada.
Whats an element?
A substance made of one atom type.
A substance made of several atoms
A substance that keeps reactions happening in the body
Neutrons have a charge of +1
Why is argon unreactive?
It is in Group 8
It has a full outer shell of electrons
It has the lowest number of outermost shell electrons out of any element in the entire periodic table.
Dmitri Mendeleev created the better version of the Periodic Table
Vertical columns in the P. Table are called groups. Rows in the P.Table are called Periods
Pb is the symbol for neon.
When drawing atoms, the __________ shell must always be filled first before moving on to the next one.
lowest
highest
biggest
smallest
furthest from the nucleus
An atom always wants a full outermost shell
Balance this equation: H2SO4 + NaOH ---->Na2SO4 + H2O
H2SO4 + 2 NaOH ---> NaSO4 +2H2O
2H2SO4 +3 NaOH ---->Na SO4 + 4 H2O
Why do equations need to be balanced?
Because atoms can't be created or destroyed in a reaction
Because #YOLO
Because they're easier to understand that way and so scientists made that rule compulsory.
