Periodic Table
How many elements are there in the Periodic Table?
118 elements
What does electron arrangement represent?
The electron configuration represents the way electrons arrange on the shells and subshells
What is electronegativity?
Electronegativity is a measure of an atom's ability to attract electrons witihin a covalent bond in its molecule
What comprises the 80% of Periodic Table?
Metals
Who is considered as the father of Periodic Table?
Dmitri Ivanovich Mendeleev
How horizontal lines and vertical columns are called?
Horizontal lines are called Periods, Vertical clolumns are called Groups
What is the shape of p-orbital?
Dumbbel
How do the metallic properties change within a period from left to right?
Metallic properties decrease from left to right within a period
All of the metals are found in solid state except for one. What metal is found in liquid state at room temperature?
Mercury (Hg)
What is molecule made of?
Molecule is made of two or more atoms
Guess the element that is found in group 7 and period 4
Manganese (Mn)
How many electrons can s-orbital hold?
S-orbital can hold 2 electrons
What is the most active metal?
Francium (Fr)
What are the metalloids?
What is the chemical symbol for gold?
Au (Gold)
What does the number of electron shells show in the Periodic Table?
It shows the Period
Define the element with the following electron configuration:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
Bromine (Br)
Is it true that electronegativity decreases as you go down the group?
It is true
What are the physical properties of Nonmetals? (colour, physical state, heat and electricity conductivity, hardness)
Physical properties of Nonmetals:
dull coloured; found in solid, liquid, gas states; do not conduct neither heat nor electricity; very brittle.
What gas do plants release during the photosynthesis?
Oxygen (O2)
What are the valence electrons?
Valence electrons are the electrons on the outermost shell
How does the electron configuration of Noble gases end?
ns2 np6
Why does the atomic radius increase from top to bottom in a group?
As the number of energy shells increase as you go down the group, the atomic radii of the elements increase too
What is the only liquid nonmetal in the Periodic Table?
Bromine (Br)
Which element is essential for human bones and teeth?
Calcium (Ca)