Which of the following is correct?A) Protons have a negative charge.B) Electrons have a mass of 1.C) Neutrons are found in the nucleus of an atom.D) Neutrons have a negative charge.
C) Neutrons are found in the nucleus of an atom.Electrons have a mass of 1/2000. Protons have a positive charge. Neutrons have no charge.
Which of these describes the relation between the number of protons, neutrons and electrons?A) Number of protons = number of neutrons and has no effect on the number of electronsB) Number of protons = number of electrons and has no effect on the number of neutrons.C) Number of protons = number of electrons = number of neutronsD) Number of neutrons = number of protons + number of electrons
B) Number of protons = number of electrons and has no effect on the number of neutrons.This means that all atoms have no charge.
An atom has an atomic number of 11 and an atomic mass of 23. How many neutrons does this atom have?A) 6B) 5C) 12D) 11
C) 12The atomic number is the amount of protons and the atomic mass is the number of protons + the number of neutrons.
What element was the last question referring to?A) OxygenB) HeliumC) SodiumD) Magnesium
C) SodiumOxygen has an atomic number of 8, magnesium has an atomic number of 12 and helium has an atomic number of 2.
Balance this equation: H2SO4 + NaOH --> Na2SO4 + H2OA) 2H2SO4 + 2NaOH --> 3Na2SO4 + 2H2OB) HSO + NaOH --> NaSO + HOC) H2SO4 + 2NaOH --> Na2SO4 + 2H2OD) H2SO4 + NaOH --> Na2SO4 + H2O
C) H2SO4 + 2NaOH --> Na2SO4 + 2H2OIt is the only one where the number of atoms on each side is the same, and no atoms have been taken away.
Who first arranged the elements in groups?A) Dmitri MeanderleevB) Dmitri MendeleevC) Dimitri NendeleevD) Demetri Mendeleev
B) Dmitri MendeleevThe other three don't exist.
How many periods are there in the Periodic Table?A) 8B) 9C) 7D) 6
C) 7There are eight groups and seven periods.
What is another name for Group 7 in the Periodic Table?A) The Alkali MetalsB) The HalogensC) The Transition MetalsD) The Noble Gases
B) The HalogensThe alkali metals are group 1, the transition metals have no group, they are the large part in the middle and the noble gases are group 0 or group 8.
What is chlorine's physical state at room temperature?A) Grey solidB) Red/Brown liquidC) Green gasD) Yellow gas
C) Green gasFluorine is a yellow gas, bromine is a red/brown liquid and iodine is a grey solid.
What colour are all noble gases at room temperature?A) GreenB) GreyC) They are colourlessD) Light blue
C) They are colourlessThey emit light when electricity is shone through them.