part 1 sodium and rubidium have the same properties with potassium. this is because sodium, potassium, and rubidium are in the same column that is they are all in group one of periodic table. all are alkali metals hence have the same properties.
part two
magnesium have 12 neutrons, 12 protons and 12 electrons
from periodic table the magnesium is atomic number 12 and has a mass number of 24.305
The atomic number is equal to number of protons that is 12
protons value is the same as electron value hence the number of electron are also 12
mass number=protons +neutrons hence
Neutron=mass number-number of protons that is 24.035-12=12 which is equal to 12 neutrons
Take the molar mass of U and add it to the molar mass of F(3).
Answer:
I'm pretty sure the answer is D, I could be wrong tho
Sorry if I'm wrong but it's 1) learner engages in scientifically oriented questions. 2) learner gives priority to evidence in responding to questions. 3) learners formulate explanations from evidence. 4) learner connects explanations to scientific knowledge. 5) learner communicates explanations.
