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WorksheetsAtomic Structure
Total questions: 9
Worksheet time: 5mins
Atoms contain negatively-charged particles that surround the nucleus. The particles are called ___________.
neutrons
electrons
protons
atoms
Most of the mass in an atom is in the _______________.
protons and neutrons
protons and electrons
neutrons and electrons
The name of the element with an atomic number of 29 is _____.
Phosphorus
Sodium
Silver
Copper
The average mass of Oxygen is _____.
8
3.5
16.00
32
A nucleus is _______________.
a very small region located at the center of an atom
the smallest particle of an element that retains the chemical properties of that element.
a positively-charged particle in an atom
a negatively-charged particle in an atom
What did Thomsen's cathode ray experiment prove about atoms?
All atoms have electrons.
All atoms have protons.
The cathode ray has electrons.
Atoms do not have electrons or protons.
Rutherford's gold foil experiment led to the discovery of which part of the atom?
Electrons
Protons
The nucleus
Neutrons
Positively charged protons repel each other, so what holds protons and neutrons together in the nucleus?
Electrons
Nuclear forces
Attraction
Repulsion
The mass of an electron is ______________ compared to the mass of a proton or neutron.
very large
slightly large
the same
Very tiny
