If a metal R forms a compound with the formula R(NO3)2 the formula of its tetraoxosulphate (VI) is
R(SO4)2
RSO4
R2SO4
R2(SO4)3
Correct answer is B
No explanation has been provided for this answer.
The conclusion from Rutherford's from radioactive substance alpha-scattering experiment is that
atoms are mostly empty space with a samll
emissions from radioactive substances consist of three main components
there is unclear pull on orbital electrons
electrons are deflected by both magnetic and electric fields
Correct answer is A
No explanation has been provided for this answer.
The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?
16
17
18
19
Correct answer is C
No explanation has been provided for this answer.
naturally radioactive
abundant in nature
a transition metal
an isotopic mixture
Correct answer is D
No explanation has been provided for this answer.
Waste plastics accumulate in the soil and pollute the environment because plastic materials are
insoluble in water
non-biodegradable
easily affected by heat
inflammable
Correct answer is B
No explanation has been provided for this answer.