valency, isotopes, atomic and mass numbers

Question 1

what happens to the vaency when the outershell is full

Answer 1

its valency will be 0

Question 2

what is octet

Answer 2

when the outermost shell has 8 electrons

Question 3

what do you do to achieve octet. explain combining capacity

Answer 3

by sharing,gaining, loosing electrons octet can be recieved this is also called combining capacity

Question 4

why do chemical reactions occur

Answer 4

when elements share electons. this also gives us a compound

Question 5

define valency

Answer 5

combing capacity of an element is the definition of valency

Question 6

how will u find the valency of chlorine sulphur and magnesium

Answer 6

chlorine is 1
S is 2
Mg is 0

Question 7

how do you denote mass and atomic number

Answer 7

atomic number is denoted with Z

mass number is denoted with A

Question 8

how do you find mass number

Answer 8

mass number is = protons + neutrons

Question 9

number of electrons determine ______

Answer 9

valency

Question 10

whats a neucleon

Answer 10

proton + neutron (which is also equal to atomic mass

Question 11

special properties of isotopes

Answer 11

uranium is used for neuclear reactions
colbalt is used in cancer treatments
iodine is used for goitre treatments