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Tenth Grade (Grade 10) Atomic Structure Questions

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Grade 10 Atomic Structure

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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.
Grade 10 Atomic Structure

This question is a part of a group with common instructions. View group »

What is the total number of electrons in a Cr3+ ion?
  1. 21
  2. 18
  3. 24
  4. 27
Grade 10 Atomic Structure
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.
Grade 10 Atomic Structure
Which statement about an atom of fluorine is correct?
  1. It contains more protons than neutrons.
  2. It contains a total of 28 protons, neutrons and electrons.
  3. Its isotopes contain different numbers of protons.
  4. Its nucleus contains 9 neutrons.
Grade 10 Atomic Structure
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
Grade 10 Atomic Structure
Which element has an atom with the electron configuration 2-8-1?
  1. magnesium
  2. sodium
  3. calcium
  4. beryllium
Grade 10 Atomic Structure
Which periodic family would have electrons in the f-block?
  1. Rare Earth Elements (Inner Transitions Metals)
  2. Transition metals
  3. Alkali Metals
  4. Lanthanides & Actinides
Grade 10 Atomic Structure
Which of the following elements has the highest electronegativity?
  1. oxygen
  2. hydrogen
  3. fluorine
  4. carbon
Grade 10 Atomic Structure

This question is a part of a group with common instructions. View group »

Which of the following statements is consistent with Dalton's model of the atom?
  1. The atom contains protons, neutrons, and electrons.
  2. The atom has a positive nucleus.
  3. The atom contains a positive nucleus with electrons in circular pathways called orbits surrounding the nucleus.
  4. The atom is indivisible and can't be destroyed.
Grade 10 Atomic Structure
When an atom loses electrons it becomes                 charged.
  1. negatively
  2. ionically
  3. covalently
  4. positively
Grade 10 Atomic Structure

This question is a part of a group with common instructions. View group »

What is the mass number of an atom with 11 protons, 11 electrons, and 12 neutrons?
  1. 11
  2. 23
  3. 22
  4. 1
Grade 10 Atomic Structure
Electrons in the outermost shell of an atom are called
  1. electrons.
  2. molecules.
  3. valence electrons.
  4. atoms.
Grade 10 Atomic Structure
Which combination of particle and charge is correct?
  1. electron: no charge
  2. proton: positively charged
  3. electron: positively charged
  4. neutron: negatively charged
Grade 10 Atomic Structure
Negatively-charged ions are called
  1. anions.
  2. cations.
  3. electrons.
  4. protons.
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