Question

study guide

• proton (+): in nucleus.
• neutron (0): in nucleus.
• electron (-): around nucleus.
• nucleus: center, holds protons + neutrons.

activities

1. labeling: draw an atom; label protons, neutrons, electrons, nucleus.
2. multiple choice: which is negative? a) proton b) neutron c) electron
3. fill - in - the - blank: protons = +; neutrons = 0; electrons =
4. matching: nucleus → ____; electron cloud → ____ (choices: holds protons + neutrons / holds electrons)
5. short answer: how does # of protons identify an element?
6. true/false: neutrons are in the nucleus.

topic 7: atom vocabulary review

study guide

• atomic number: # of protons.
• mass number: protons + neutrons.
• isotopes: same element, different neutrons.
• electron cloud: area around nucleus where electrons move.

activities

1. matching: atomic number → ____; mass number → __; isotope → ____
2. fill - in - the - blank: the ______ is the region where electrons are found.
3. multiple choice: which is the smallest particle? proton / neutron / electron
4. short answer: explain atomic mass vs. mass number.
5. word bank: proton, neutron, electron, nucleus (fill blanks in sentences).
6. puzzle: create a mini crossword with 4 atom vocab terms.

Explanation:

Step1: Answer multiple - choice question 2

Protons are positive, neutrons are neutral, and electrons are negative. So the answer is c) Electron.

Step2: Fill - in - the - blank for question 3

Electrons are negative, so the blank is filled with “-”.

Step3: Matching for question 4

The nucleus holds protons + neutrons, and the electron cloud holds electrons. So Nucleus → Holds protons + neutrons; Electron cloud → Holds electrons.

Step4: Answer short - answer question 5

The number of protons is unique to each element. Each element has a specific number of protons, called the atomic number, which determines its identity on the periodic table.

Step5: True/False for question 6

Neutrons are in the nucleus, so the answer is True.

Step6: Matching for activities question 1

Atomic number → # of protons; Mass number → Protons + Neutrons; Isotope → Same element, different neutrons.

Step7: Fill - in - the - blank for activities question 2

The electron cloud is the region where electrons are found.

Step8: Answer multiple - choice question 3

Electrons are the smallest of the three particles (proton, neutron, electron).

Step9: Answer short - answer question 4

The mass number is the sum of protons and neutrons in an atom of a particular isotope. Atomic mass is the weighted average of the masses of all naturally - occurring isotopes of an element.

Answer:

1. c) Electron
2. -
3. Nucleus → Holds protons + neutrons; Electron cloud → Holds electrons
4. The number of protons is unique to each element and is called the atomic number which determines the element's identity on the periodic table.
5. True

Activities 1. Atomic number → # of protons; Mass number → Protons + Neutrons; Isotope → Same element, different neutrons
Activities 2. electron cloud
Activities 3. Electron
Activities 4. The mass number is the sum of protons and neutrons in an atom of a particular isotope. Atomic mass is the weighted average of the masses of all naturally - occurring isotopes of an element.