Introduction - Elements & Periodic Table

Which of the following determines the chemical properties of an element?

• Mass number

• Number of Protons

• Number of Electrons

• Number of Neutrons

What do elements in the same period have in common?

• Same chemical properties

• Same number of occupied shells

• They form same number of isotopes

• They have same number of valence electrons

Describe where do you find metals in the periodic table?

What is the stable electronic configuration of Chromium? (Atomic Number: 24)

An atom has the following electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d3 . Identify the period, group and name of the element.

Identify the odd one out.

• Neon

• Oxygen

• Magnesium

• Silicon

Write the symbol, charge and name of the ions you would expect atoms of Bromine element to form.

When an excited electron drops back to lower energy level, it releases energy in the form of a ________.

Write the ground state inert gas electron configuration of each of Arsenic atom, Z = 33.

Which of these element(s) is/are most likely to lose its valence electron/s?

• Phosphorous

• Calcium

• Magnesium

• Titanium