Definitions Flashcards
1
Q
Define the relative isotopic mass (2 marks)
A
Mass of an atom of that isotope
Relative to 1/12th mass of a C-12 atom
2
Q
Define relative atomic mass (2 marks)
A
Mean mass of an atom
Relative to 1/12th mass of a C-12 atom
3
Q
What is a covalent bond (2 marks)
A
electrostatic attraction between 2 nuclei
Between bonding pairs of electrons
4
Q
Define periodicity in terms of atomic radius in P2 and P3 (3 marks)
A
- pattern of repeating physical and chemical properties with increasing atomic number
- atomic radii decreases across the period
- trends repeated in Period 3
5
Q
Define ionic bonds (2 marks)
A
(Strong) Electrostatic attraction
Between oppositely charged ions
6
Q
Define ionic bonds (2 marks)
A
(Strong) Electrostatic attraction
Between oppositely charged ions
7
Q
In the mass spectrum of silicon, there is also a small peak at m/z = 14. Deduce the formula of this particle.
A
28 Si2+
8
Q
What is the definition of electronegativity? (2 marks)
A
- Measure of an atom’s ability to attract a pair of e-s
- in a covalent bond
