Diagnostic Test of Grade 11

Define atom.
Choose three correct statements.

• The smallest part of an element

• Atoms can combine with other atoms to form molecules but cannot be divided into smaller parts by ordinary chemical processes.

• Most of the atom is empty space

• Most of the atom has space

Choose three correct statements.

• the negative electrons are attracted to a positive force, which binds them to the nucleus.

• the nucleus is small and dense compared with the electrons, which are the lightest charged particles in nature.

• The electrons circle the nucleus in orbital paths called shells, each of which holds only a certain number of electrons.

• the negative electrons are attracted to a negative force, which binds them to the nucleus.

The key shell is the outermost one, called the ............ shell.

• valence

• sub

• partial

• inner

What is atomic number?

• the total number of protons in its nucleus

• the total number of electrons in its nucleus

• the total number of charge in its nucleus

• the total number of protons in its shell

If it gains an electron, it becomes a .....

• negative ion

• positive ion

• proton

• electron

If a neutral atom loses an electron, it becomes a ............

• positive ion

• negative ion

• neutral

• proton

Ordinary atoms that either gain or lose electrons are called...

• ions

• electron

• neutron

• proton

Three basic types of subatomic particles in an atom are....

• protons

• neutron

• electron

• nuclear

The ordinary atom is an exception; it contains one proton but no neutrons. What is this element?

• hydrogen

• helium

• oxygen

• chlorine

Choose all correct statements.

• protons have a positive electrical charge

• neutrons are electrically neutral

• nucleus has a positive charge.

• electrons have a negative electrical charge