SC6 Flashcards
(4 cards)
1
Q
What are covalent bonds?
A
A pair of electrons shared between two non-metal atoms. It is the electrostatic forces of attraction between the positive nuclei and the negative electrons in the bonded atoms.
2
Q
What is the valency of an element?
A
The numbers of covalent bonds formed by atoms of the element.
3
Q
What are the characteristics of ionic bonds?
A
- Formed by losing or gaining electrons
- Formed between a metal and a non-metal
- Ionic substances form ionic lattices
- Molecular formula shows the ratio of ions in the lattice
4
Q
What are the characteristics of covalent bonds?
A
- Formed by sharing electrons
- Usually formed between two non-metals
- Covalent substances form molecules
- Molecular formula shows the actual number of atoms in the molecule
