Answer:
(a) (i) All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell. (ii) All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.
Answer: There are 
molecules 
gas are in 756.2 L.
Explanation:
It is known that 1 mole of any gas equals 22.4 L at STP. Hence, number of moles present in 756.2 L are calculated as follows.
According to mole concept, 1 mole of every substance contains 
molecules.
Therefore, molecules of S present in 33.76 moles are calculated as follows.
Thus, we can conclude that there are molecules gas are in 756.2 L.
Explanation:
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Well, a compound has a total charge of 0. So, it's electrically neutral. Since the X is 3+ and the Y is 3- they add to 0. Meaning no subscripts are necessary. Why don't you try a different combo?
Like:
A^3 and B^1-, to get a 3- charge you need 3xB^1- so the formula is AB3
Does this help?
Answer:
Answer is given below:
Explanation:
The way it is made (3) Structure.
The basic unit of life (7) Cell.
Perform the different functions of cell (7) Organelles.
No nucleus and unicellular (1) Prokaryote.
Composed of many cells (6) Tissue.
Concluded that all animals are made of cells (10) Theodore schwann .
Contains the genetic information (2) Nucleus.
Concluded that all plants are made up of cells (9) Matthias Schleilden.
Concluded that all cell came from pre existing cells (10)
Rudolf Virchow.
Has a nucleus and some are unicellular, but mostly
multicellular (4)
Eukaryote
