Answer:
option B= Al, Ga and In
Explanation:
Properties of Boron group:
- These elements are belongs to boron group which is thirteen group of periodic table. There are six elements are in this group boron, aluminium, gallium, indium, thallium and nihonium.
- They are also called p-block elements because their valance electrons are present in p subshell.
- All these elements have three valance electrons.
- Boron is metalloid while other elements are metals.
- Their oxidation state is +3 because of tendency to lose three valance electrons and create positive charge.
- Their atomic sizes increases down the group with increase of atomic number.
- Their ionization energies decreases down the group because of increase of atomic radius and ease of removing of electrons.
The conversion factor is added to the original given unit so that you can end up with the final unit. Basically, the conversion unit does not change the value because the factor is just equal to 1. You just manipulate the units by cancelling them.
Among the given choices, the fraction which is equal to 1 is 10⁻³ g/ 1 mg, because there are 1,000 mg per 1 g. In reverse, that would be 10⁻³ of a gram.
The charge of the ion is +1
Avegadro's number = 6.02 x10^23 atoms
so
3.5g x 1mol/63.55g Cu x 6.02 x 10^23/ 1mol=3.32 x 10^22 atoms
Answer:
The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen.
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