Building Atoms: Grade 12 Chemistry
Explore the fundamental components of atoms, their structure, and how they interact in this Grade 12 chemistry worksheet.
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Building Atoms: Grade 12 Chemistry
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Read each question carefully and answer to the best of your ability. Show all work where applicable.
1. Which subatomic particle determines the identity of an element?
Electron
Neutron
Proton
Photon
2. An isotope of an element will have a different number of:
Protons
Electrons
Neutrons
Atomic number
1. The mass number of an atom is the sum of its and .
2. An atom that has gained or lost electrons is called an .
3. The model of the atom describes electrons existing in specific energy levels or shells around the nucleus.
1. All atoms of the same element have the same number of neutrons.
True
False
2. The atomic number represents the total number of protons and neutrons in an atom's nucleus.
True
False
1. Describe the primary differences between the Rutherford model and the Bohr model of the atom.
2. Explain why atoms are typically electrically neutral.
Match each term on the left with its correct definition on the right.
1. Nucleus
a. Negatively charged subatomic particle
2. Electron
b. Central part of an atom, containing protons and neutrons
3. Atomic Mass
c. The weighted average mass of an element's isotopes
4. Ion
d. An atom with a net electrical charge due to loss or gain of electrons