How do metal atoms form ions?
They lose electrons to form negative ions
They gain electrons to form positive ions
They lose electrons to form positive ions
Which of these statements about a negative ion is true?
It has an equal number of protons and electrons
It has more protons than electrons
It has more electrons than protons
What happens when sodium and chlorine atoms form sodium chloride?
An electron transfers from each sodium atom to each chlorine atom
An electron transfers from each chlorine atom to each sodium atom
Sodium and chlorine atoms share electrons
What is a covalent bond?
A bond formed between oppositely charged ions
A bond formed when two atoms share a pair of electrons
A bond formed by delocalised electrons
In a dot and cross diagram, what does each dot and cross represent?
A neutron
A proton
An electron
What is the greatest number of covalent bonds that one carbon atom can form?
2
3
4
What combination of elements will form covalent bonds?
Metal atom and another metal atom
Metal atom and non-metal atom
Non-metal atom and another non-metal atom
Which statement about simple covalent molecules is correct?
Strong bonds between atoms in molecules, but weak forces between molecules
Weak bonds between atoms in molecules, and weak forces between molecules
Weak bonds between atoms in molecules, but strong forces between molecules
What force is overcome when covalent molecular substances melt or boil?
Intermolecular forces
Covalent bonds in molecules
Electrostatic forces between ions
Which of the following pairs of elements would join together with ionic bonding?
Iron and sulfur
Iron and chromium
Hydrogen and sulfur