Answer: -
Group 5 - Metalliods.
Group 7 - Halogens Group
Group 8 - Noble Gases
Explanation: -
Group 1 are the alkali metals.
Group 2 are the alkaline earth metals.
Group 5 are a part of transition metals which range from Group 3 to Group 12.
Group 17 are the halogens.
Group 18 are the noble gases.
Answer:
2.13 x 10³moles
Explanation:
Given parameters:
Number of molecules in AlF₃ = 1.28 x 10²⁷molecules
Unknown:
Number of moles = ?
Solution:
A mole is a quantitative unit in chemistry used of taking measurements.
A mole of a substance is the amount of that substance that contains the avogadro's number of particles.
The particles can be molecules, atoms, neutrons, protons, electrons or formula units.
Number of moles = ![\frac{number of molecules }{Avogadro's number}](https://tex.z-dn.net/?f=%5Cfrac%7Bnumber%20of%20molecules%20%7D%7BAvogadro%27s%20number%7D)
Number of moles =
= 2.13 x 10³moles
Answer:
The answer is A
Explanation:
Wavelength is the distnce between the peak or crests in a wave.