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S-block is found on the ............. side of periodic table and consists of .......... groups
left - 2
Mosely arranged elements according to atomic number not atomic mass (GR)
Because properties of elements related to atomic number not atomic mass
Mass number is always graeter than atomic number (GR)
Because mass number is the number of protons and neutrons but atomic number is protons only
Elements of the same group have similar properties (GR)
Because all have the same number of electrons in outermost energy level
The M level is filled with electrons before N level (GR)
because energy of M is less than energy of N
The valency of inert gases is zero (GR)
Because their outermost energy level is completely filled
The atom is electrically neutral (GR)
Because number of positive protons = number of negative electrons
The elements of p-block begins with .......... group and ends with ........... group
3A  -  Zero
Thebuilding unit of matter
Atoms
mixture its components can not be distingushed by naked eye
Homogeneous mixture
A group of gases of zero gtoup
Inert gases
The outermost energy level of metals contains ............... electrons but non-metals contains ............... electrons
less than 4  -  more than 4
Substance consists of two or more substances not chemically combined
Mixture
Scientist who arranged elements according to atomic mass
Mendleeve
Substance its molecules consist of different atoms
Compound
Substance its molecules consist of similar atoms 
Element
Liquid non-metal element
Bromine
Liquid metal element
Mercury
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