Getting ready for Chemistry

The following statements are correct EXCEPT:

• An atom is the smallest unit of an element that can exist by itself.

• Electrons orbiting around the nucleus of an atom make up most of the mass of the atom

• An atom has no overall charge.

• Electrons orbiting the nucleus of an atom do so in energy shells.

Which of the following metals react most vigorously with water?

• Magnesium

• Calcium

• Barium

• Beryllium.

Which one of the following is a halogen?

• Iodine

• Oxygen

• Sodium

• Calcium

Which of the Group 7 elements is a liquid at room temperature and atmospheric pressure?

• Bromine

• Chlorine

• Fluorine

• Iodine.

Which element has the SMALLEST atomic radii?

• Fluorine

• Chlorine

• Bromine

• Iodine.

Here is the electronic configuration of four elements. Which element will be a METAL?

• 2,8,8

• 2,8,7

• 2,8,6

• 2,8,1

Here is the electronic configuration of four elements. Which element will be a NOBLE GAS?

• 2,8,8

• 2,8,7

• 2,8,6

• 2,8,1

He proposed the Law of Octaves.

• Henry Mosely

• Dimitriv Mendeleev

• John Newlands

• Johann Dobereiner

He proposed the Law of Triads.

• Henry Mosely

• Dimitriv Mendeleev

• John Newlands

• Johann Dobereiner

He is widely credited with creating the first version of the periodic table.

• Henry Mosely

• Dimitriv Mendeleev

• John Newlands

• Johann Dobereiner