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Topic C1: Particles
C1.2 Atomic Structure
C1.2.1 The Structure of an Atom
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Cards (22)
What is the smallest unit of an element that retains its chemical properties?
Atom
Electrons have a relative mass of 1.
False
Electrons orbit the nucleus in specific energy levels known as electron
shells
What is the charge of a neutron?
0
Where do protons reside in an atom?
Nucleus
Match the subatomic particle with its properties:
Protons ↔️ +1 charge, mass 1
Neutrons ↔️ 0 charge, mass 1
Electrons ↔️ -1 charge, negligible mass
Protons and neutrons reside in the central
nucleus
Neutrons have a charge of -1.
False
The mass number is the total number of protons and
neutrons
What are isotopes of the same element defined as?
Same protons, different neutrons
Order the energy levels of an atom from closest to farthest from the nucleus:
1️⃣ n=1
2️⃣ n=2
3️⃣ n=3
4️⃣ n=4
Protons and neutrons are located in the central core of the atom called the
nucleus
What is the charge of a proton?
+1
Neutrons have a negative charge.
False
Electrons have a charge of
-1
Electrons orbit the nucleus in fixed circular
paths
.
True
What are the three main subatomic particles that make up an atom?
Protons, neutrons, electrons
Where are protons and neutrons located in an atom?
Nucleus
What is the atomic number of an element defined as?
Number of protons
Match the term with its definition:
Atomic Number ↔️ Number of protons in the nucleus
Mass Number ↔️ Total number of protons and neutrons
Isotopes of the same element have identical physical and chemical properties.
False
What is the maximum number of electrons that the first energy level (n=1) can hold?
2