Periodic Table of Elements Directions: Use the periodic...

Periodic Table of Elements Directions: Use the periodic table to fill in the below chart. Element Symbol Atomic Number # of protons # of electrons Atomic Mass Rounded Atomic Mass (show sol'n) # of Neutrons Period 1 Oxygen O 8 8 8 15.999 16 16 - 8 = 8 2 2 Helium 3 Carbon 4 Aluminum 5 Calcium 6 Sodium 7 Potassium 8 Nitrogen 9 Silicon 10 Iron

Transcript

00:01 Hello students let's solve this question this question is based to the periodic table in periodic table the elements are arranged according to their groups and periods according to their chemical properties there are certain elements that are given in the question and we have to find their symbols number of protons so the elements so the given elements are firstly here the elements that are given in the question that must be written there is the symbols that use to designate them then their atomic number then the number of protons present in it then the number of electrons present in it then the atomic mass number then the rounded rounded mass number then the neutrons present in it finally to the period they belong now the first element is the helium first element is the helium so the simple used for helium is acci its atomic number is two number of protons are two electrons are two mass number is four point zero zero two rounded is four number of neutrons are number of mass number minus the number of protons so it comes to be two it belongs to the first period now the next given element is the next given element is the carbon so carbon has a symbol c its atomic number is 6 it has 6 protons 6 electrons mass number is 12 .011 rounded of mass number is 12 so its number of neutrons are we have to subtract mass number from protons so it comes to be 6 and it belongs to the second period now the next element is the aluminium aluminium the symbol used for aluminium is al its atomic number is 13 has 13 protons 13 electrons it has atomic mass of 26 .982 and it has around atomic mass 27 a number of 14 and it belongs to the third period.

02:41 Now the next element is the calcium.

02:46 Next element is calcium.

02:50 The symbol used for calcium is ca.

02:54 Its atomic number is 20, 20 protons, 20 electrons and it has atomic mass of 40 .078, rounded of 40.

03:05 Neutrons are 20 minus 20 20 and it belongs to a fourth period now the next given element is sodium next given element is sodium sodium the simple used for sodium is anna its its atomic number is 11 11 protons 11 electrons it atomic mass is 22 .9.

03:40 Rounded of atomic mass is 23.

03:43 It has 23 minus 11 that is 12 neutrons and it belongs to the third period.

03:53 Now the next given element is the potassium...

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