Period
Group
Explanation:
On the periodic table the numbers 1,2 and 3 can represent either groups or periods.
The periodic table gives the arrangement of elements based on their atomic numbers
- They are divided into vertical columns and horizontal rows
- The vertical columns are the groups whereas the horizontal rows are the periods.
- The vertical columns are made up of elements having the same number of electrons in their outermost shell.
- The horizontal columns are made up of elements having the same number of shell.
- On the periodic table, the groups are numbered 1 - 18
- There are 7 periods on the table.
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Answer:
20 different kinds of minerals make up 95% of earth's rocks.
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A chemical formula of a molecule is an expression which states the number and type of atoms<span> present in a </span>molecule of a substance. While the structural formula, is a formula of <span>a chemical compound that is a graphic representation of the molecular </span>structure<span>, showing how the atoms are arranged.</span>
Answer:
The term "sustainable communities" has various definitions, but in essence refers to communities planned, built, or modified to promote sustainable living. Sustainable communities tend to focus on environmental and economic sustainability, urban infrastructure, social equity, and municipal government.
Answer:
: conjugate acid of 
: conjugate base of 
: conjugate base of
: conjugate acid of
Explanation:
According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.
Here in forward reaction is accepting a proton, thus it is considered as a base and after accepting a proton, it forms which is a conjugate acid.
And is losing a proton, thus it is considered as an acid and after loosing a proton, it forms which is a conjugate base.
Similarly in the backward reaction, is loosing a proton, thus it is considered as a acid and after loosing a proton, it forms which is a conjugate base.
And is accepting a proton, thus it is considered as a base and after accepting a proton, it forms 
which is a conjugate acid.
