The Periodic Table

Question 1

What does the classification of known elements show

Answer 1

It shows the periodic behaviour

Question 2

Atomic Number definition

Answer 2

Number of protons in the nucleus

Question 3

Atomic Mass

Answer 3

Mass of proton & neutrons in the nucleus

Question 4

Isotopes

Answer 4

Forms of an element that have the same atomic number but a different numbers of neutrons

Question 5

Pure chemical substance

Answer 5

composed of atoms with the same number of protons in the atomic nucleus

Question 6

Atoms species

Answer 6

All atoms with the same number of protons in the atomic nucleus

Question 7

Chemical Element

Answer 7

Consists of atoms with the same number of protons

Question 8

Relative atomic mass

Answer 8

takes into account the relative abundance of isotopes

Question 9

What do biological system require

Answer 9

Biological systems do require all the 90 naturally occuring elements humans need 25 elements to conduct a healthy life

Question 10

Organic Chemistry

Answer 10

Chemistry with carbon bound compounds

Question 11

What do elements need to be used by a biological system

Answer 11

elements must be abundant in the environment and in an easily extractable form

Question 12

the II elements required for all biological city

Answer 12

oxygen, hydrogen, carbon, Nitrogen, Sodium, Potassium, Calcium, Magnesium, Phosphorus, sulfur, Chlorine

Question 13

what are the other elements required by biological systems

Answer 13

Al, As, B, Br, Ba, Cl, Cu, F, Fe, I, Li, Mn, Mo, Ni, Se, Sr, V, W, Zn

Question 14

Nitrogen vs carbon

Answer 14

Ammonia could constitute an alternative solvent for Life to water and that nitrogen-based equivalents of proteins and nucleic acids could form.
The ancestral source of nitrogen in biological molecules is believed to be ammonia.
Ammonia is flammable in the presence of oxygen

Question 15

why carbon

Answer 15

It forms stable and complex molecules when it binds to other elements such as O, H, N, P and S.