Who is the father of the modern periodic table?
Dmitri Mendeleev.
Who first classified elements?
Dobereiner.
What does the modern periodic law state?
Properties of elements are periodic functions of their atomic numbers.
How are elements arranged in the modern periodic table?
By increasing atomic number.
How many periods are in the periodic table?
7.
How many groups are in the periodic table?
18.
What are vertical columns in the periodic table called?
Groups.
What are horizontal rows in the periodic table called?
Periods.
Which element has atomic number 1?
Hydrogen.
Which is the first element in the periodic table?
Hydrogen.
Which group contains the noble gases?
Group 18.
What is another name for Group 1 elements?
Alkali metals.
What is another name for Group 2 elements?
Alkaline earth metals.
What is another name for Group 17 elements?
Halogens.
How many free electrons are present in Halogen group elements?
7.
What is the valency of Halogens?
1.
Which group contains the most reactive nonmetals?
Group 17.
Which period contains the most elements?
6th period (32 elements).
Name the smallest period in the periodic table.
1st period (2 elements – Hydrogen and Helium).
Which is the last element in the modern periodic table?
Oganesson (Og).
How many elements are present in the modern periodic table?
118.
Which element is a liquid metal at room temperature?
Mercury.
Which nonmetal is a liquid at room temperature?
Bromine.
Which is the lightest metal?
Lithium (Li).
Which element is called the 'fuel of future'?
Hydrogen.
Which is the heaviest naturally occurring element?
Uranium.
Which element has the highest electronegativity?
Fluorine.
Which element has the lowest electronegativity?
Cesium.
Which element is used in thermometers?
Mercury.
Which element is essential for respiration?
Oxygen.
Which metal is found in blood?
Iron.
Which gas is used in balloons and is lighter than air?
Helium (He).
Which element is found in diamonds?
Carbon.
Which noble gas is used in signage?
Neon.
Which is the hardest naturally occurring element?
Carbon (in diamond form).
Which is the most reactive metal?
Francium.
Which is the most reactive nonmetal?
Fluorine.
Name the nonmetal with lustre.
Carbon (as graphite/diamond) and Iodine.
Which gas is used in welding?
Argon (Ar).
Which noble gas is found most abundantly?
Argon (Ar).
How many electrons are present in noble gases?
Zero (they have a full outer shell).
Which noble gas was newly added to the periodic table?
Oganesson (Og).
How many gases are found in the modern periodic table?
11.
Name all noble gases.
Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn), Oganesson (Og).
Which actinide is used in nuclear fuel?
Uranium.
Which lanthanide is used in color TVs?
Europium.
What is the atomic number of Sodium?
11.
Which element is called white gold?
Platinum (Pt).
Which element is also called black lead?
Graphite.
Name a radioactive element found in India.
Thorium (Th).
Which element has the highest specific heat?
Hydrogen.
Which element has the highest ionization potential?
Helium.
Which man-made actinide is used in atomic bombs?
Plutonium.
Which gas is used in fluorescent lamps?
Argon.
Which element is used in batteries?
Lithium.
Which element is used in antiseptics?
Iodine.
Which element is used in fertilizers?
Nitrogen.
Which metal is used in aircraft construction?
Aluminum.
Which element is used in toothpaste?
Fluoride (from fluorine).
Which metal is used in galvanization?
Zinc.
Which noble gases are used in lasers?
Helium-Neon.
Which gas is used in fire extinguishers?
Carbon dioxide (COâ‚‚).
Which element is used in semiconductors?
Silicon.
Name the only nonmetal that conducts electricity well.
Graphite.
How many metals are present in the modern periodic table?
91.
How many nonmetals are present in the periodic table?
17.
How many metalloids are there in the periodic table?
7.
Which is the densest noble gas?
Radon (Rn).
What is the atomic number of Silicon?
14.
What is the atomic number of Oxygen?
8.