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You can create printable tests and worksheets from these Grade 10 Atomic Structure questions! Select one or more questions using the checkboxes above each question. Then click the add selected questions to a test button before moving to another page.

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Which of the following atoms has the fewest electrons?
1. ${::}_53^127I$
2. ${::}_52^128Te$
3. ${::}_51^123Sb$
4. ${::}_50^121Sn$

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In a famous experiment conducted by Ernest Rutherford, positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?
1. The nucleus is negatively charged.
2. The atom is a dense solid and is indivisible.
3. The mass is conserved when atoms react chemically.
4. The nucleus is very small and the atom is mostly empty space.
Which is the electron configuration of a neutral atom with a total of six valence electrons?
1. $1s^2 2s^2 2p^2$
2. $1s^2 2s^2 2p^4$
3. $1s^2 2s^2 2p^6$
4. $1s^2 2s^2 2p^6 3s^2 3p^6$

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Which of the following pairs shows isotopes of the same element?
1. $""_6 ^12C and ""_6 ^12C$
2. $""_6 ^14C and ""_7 ^14N$
3. $""_6 ^14C and ""_6 ^12C$
4. $""_6 ^14C and ""_6 ^14C^-4$
An atom's valence electrons are those in its                       .
1. outermost energy level
2. lowest energy level
3. electron clouds
4. inner energy level
An atom consists of what key, primary components?
1. ions, protons, electrons
2. protons, electrons, molecules
3. protons, electrons, neutrons
4. elements, neutron protons

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Thallium has two isotopes, thallium-203 and thallium- 205. Thallium's atomic number is 81, and its atomic mass is 204.38 amu. Which statement about the thallium isotopes is true?
1. There is more thallium-203 in nature.
2. Atoms of both isotopes have 81 protons.
3. Thallium-205 atoms have fewer neutrons.
4. The most common atom of thallium has a mass of 204.38 amu.

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Aluminum atoms tend to react to form                  ions.
1. $3^+$
2. $1^+$
3. $5^-$
4. $3^-$
Group 17 elements, the halogens, are the most reactive of the nonmetals because they
1. require only one electron to fill their outer energy level.
2. have the highest ionization energies.
3. have the largest atomic radii.
4. are the farthest to the right in the periodic table.
Which feature of the electron configuration determine the chemical properties of an element?
1. Its total number of electrons
2. The number of electrons in the first shell
3. The number of valence electrons
4. The number of electrons in the second shell
The chemical properties of an atom and the types of bonds it may make are primarily determined by the number of
1. neutrons it has in its nucleus.
2. protons it has in its nucleus.
3. energy levels it has.
4. electrons it has in its outermost energy level.