Periodic Table

February 09, 2020 Ahmed A

Main criteria

Periodic Table

Main criteria

(Atomic Number) The number of protons in the nucleus of an atom. Also called the proton number. The higher the atomic number, the heavier the atom is. Atomic Mass=Mass of Protons + Mass of Neutron.


the elements are arranged in order of increasing atomic number the horizontal rows are called periods the vertical columns are called groups elements in the same group are similar to each other The main groups are numbered from 1 to 7 going from left to right  and the last group on the right is group 0 The section in the middle of the table is called the Transition Metals. If you know what one of the elements in a group is like, you can make predictions about the other elements in a group. all the elements in group 1 are reactive metals  and all the elements in group 0 are unreactive non-metals. The zig-zag line in this diagram separates the metals, on the left, from non-metals, on the right. Hydrogen is a non-metal but it is often put in the middle. Notice that most elements are metals, rather than non-metals. Each element has its own chemical symbol, made from letters. Remember that you will only find elements in the periodic table and never compounds. (So you won’t find substances like water or copper sulphate in the periodic table) You can accurately predict that Potassium it will have the lowest melting point, the highest density and the highest reactivity of all the elements in group 1. In a neutral atom, the number of protons and electrons is the same. Reaction between Acid and Alkali produce Salt and water.(Locate acid and alkali from the table) Reaction between metal and oxygen form oxide.


Have you thought about online lessons?

Online tuition gives you access to brilliant tutors across the country
Connect one-to-one with a tutor or share your lesson with a group for 50% of the tutor's hourly rate! Find a Tutor for One-to-One Find an Online Study Group

Want to know more?

Visit Ahmed's profile to find out more and send a message.

Visit Ahmed's Profile

Resources others found helpful

Taking the PEE... The Point, Evidence, Explanation method

How to cover all bases and give structure to your paragraphs when answering questions on a set piece …

learn more

Grammar videos

To develop a strong understanding of grammar

learn more

Specific Learning Disorder

This section explains what specific learning disorders are and describes some of their key features

learn more

STEM Applications to Oxbridge (Oxford and Cambridge)

This article attempts to shine some light on the Oxbridge Admissions process for STEM-based …

learn more

Free resources, revision notes and past papers for students

Find revision guides, exam papers and sample essays amongst hundreds of free resources available to students.

Find resources any subjects

Maths resources | Science resources | Music resources | Spanish resources | English resources | French resources