History
Arranged a number of the elements in triads.
Döbereiner
Where are non-metals located in the periodic table?
The far right side of the table.
Which one has the biggest atomic radius? Potassium or Bromine, explain
Potassium as you move across, the atomic size decreases.
Lightest and most abundant element in the universe. It is used in the production of ammonia.
Hydrogen
What is the symbol of lead?
Pb
Which chemists discovered the relationship he called the law of octaves?
Newslands
They are located in the middle of the periodic table and have their highest energy electrons in d orbitals.
Transitional metals
Which one has the largest atomic radius?
Lithium or Cesium
Cesium as you move down size increases.
It is the most abundant in the earth's crust. It is essential for life in all animals and humans.
Oxygen
What is the element of Sn?
Tin
What was Moseley's contributions to the creation of the periodic table?
He use the atomic number as the organizing factor for the elements of the periodic table.
Name three things you can generally find in a cell on the periodic table
Atomic number, atomic mass, and electron configuration (structure).
Which ones have larger ionization energies?
Lithium or Neon
Lithium or Francium
Neon in the first pair as ionization energy increases as you move across the table.
Lithium in the second pair, as you go down a group, energy decreases.
What family is this? Name and number
Flourine, chlorine, bromine, iodine, and astatine.
Halogen, group 17
What are the symbols of the following elements: Radon, copper, and mercury?
Rn, Cu, and Hg
What were two major accomplishments that Pauling achieved?
Nobel Prize winner and developed an electronegativity scale.
Mention the characteristics of metals.
Good conductors of heat and electricity, usually hard, lustrous, malleable, and ductile.
What periodic trend plays a central role in predicting how atoms combine chemically with each other?
Elements with atomic numbers greater than that of uranium are called
Transuranium elements.
Say the elements of the following symbols: As, Zn, and Pu
Arsenic, Zinc, and Plutonium
How did Mendeleev arranged elements in the periodic table and what did we do that amazed many scientists?
Atomic mass. He predicted elements to fit in empty spaces in the periodic table that later were discovered.
Mention the name of all the noble gases (6), without looking at the periodic table.
Helium, neon, argon, krypton, xenon, and radon.
Flourine as it is the one farthest to the right side of the periodic table (electronegativity increases across the table) and Francium because it is to the left and bottom of the periodic table.
Why do elements in the same family have similar physical and chemical properties?
They have similar electron configurations. Electron arrangements.
How many elements are there in the periodic table? Mention the big groups in it, and where they are located.
There are 118 elements. It is classified in metals, non-metals and metalloids. Metals are on the left side, non-metals on the right side and metalloids step case between metals and non-metals.