Page 10 - Science E-Book Prep.2 2024-2025 1st term_Neat - Copy
P. 10
Unit 1 Graduation of the properties of
Lesson2 elements in the
modern periodic table
properties
Atomic size Electronegativity Metallic and
non-Metallic
property
Atomic size
The atomic radius is a measure of the atomic
size of the atom.
Its unit is picometer (p).
(The picometer = part from million million
parts of a meter 1 p = 10-12 m)
Graduation of the atomic size of elements in the periodic
table
In Periods In Groups
Atomic size decreases due to Atomic size increases due to
increasing the attraction force increasing number of energy
between nucleus & electrons 10 levels
2nd Prep. First Term
