Answer:
B --> Different types of electromagnetic radiation
Explanation:
Science tells us that light is the reason we are able to see objects. Without light, we wouldn't be able to ... The electromagnetic spectrum is the range of all types of electromagnetic ... C x-rays. D light.
Answer:
C) Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.
Explanation:
For this reaction, the reactants are the hydrobomic acid and the lithium hydroxide which produces the products lithium bromide and water. The chemical equation should be as follows:
HBr(aq) + LiOH(aq) = LiBr(aq) + H2O(l)
Answer:
C. protons and electrons are far apart with empty space in between
Given :
The atomic weight of copper is 63.5 gm.
To Find :
The total number of gram atoms and number of atoms present in 100 gram of copper.
Solution :
We know, 1 gram atom is equal to mass of one mole of copper i.e. 63.5 gm.
So, number of gram atom in 100 gram of copper is :
n = 100/63.5
n = 1.57 gram atom
Now, number of atoms on gram atom is :

Therefore, total number of gram atoms and number of atoms present in 100 gram of copper is 1.57 gram atom and
.
Hence, this is the required solution.