Periodic Table 1
The location of protons and neutrons.
Nucleus of an atom
Why are noble gases called noble?
Because they are unreactive.
The modern periodic table was made by
Henry Moseley
Found in a zigzag line on the periodic table.
Metalloids
The location of electrons.
What is outside the nucleus?
How many elements are on the periodic table?
118 elements!
What is the role of neutrons in an atom?
It prevents the protons from repelling and keeps the nucleus stable.
The atomic number tells you
The number of protons an atom of an element has
Cation means
How many elements are there in this substance? K2Cr2O7
3
2,8,8,1
These are the properties of metals.
High melting and boiling points
Malleable, lustrous, ductile, solid, good conductors
What is the trend of atomic radius across a period?
Decreases across a period.
Alloys are made from
Mixing a metal and metal
Mixing a metal and non metal
Give one use of silicon element.
Semiconductors, computer chips
What is the formula for finding the neutrons of an atom?
Atomic mass - Atomic number (A-Z)
Name one acid present in the stomach
Hydrochloric acid
Which is the element on group 2, period 4?
Calcium
Today's periodic table was made by
Henry Moseley
Elements in same group the share similar _____.
Valence electrons
Properties
Which is the smallest element according to atomic size?
Guess the formula of a compound formed from aluminium and chlorine.
AlCl3
Group of elements that are obtained from the crust of the earth as mineral salts
Alkaline earth metals
Beryllium chloride BeCl2
Sodium Chloride NaCl
Which element's electron configuration does the first and the second shell obtain?
Neon (2, 8)