18 Questions
What is the unique identifier for each element in the atomic structure?
Number of protons
What is the force that opposes the pull of the nucleus on the electrons moving in a circular path in the orbit?
Centripetal force
What is the charge of an ion with 12 protons and 10 electrons?
-2
What is the term for atoms with the same atomic number but different mass numbers?
Isotopes
What is the number of protons in the nucleus of an atom that has a mass number of 40 and an atomic number of 20?
20
What is the charge of an electron in coulombs?
1.602 x 10^-19 C
What determines the chemical and electrical reactivity of a material?
Number of electrons in the valence shell
What is the purpose of the 'octet rule' in atomic chemistry?
To stabilize the valence shell of an atom
What happens to the valence electrons when an atom is energized?
They become dislodged and turn into free electrons
What is the characteristic of a material with a valence electron count of 1-3?
It is a good conductor
What is the term for the outermost energy level of an atom?
Valence shell
Which of the following elements is a noble gas?
Neon
What is the difference between Cl 35 and Cl 37?
Number of neutrons
What is the maximum number of electrons in the third energy level (n = 3)?
18
What is the Aufbau principle?
Orbitals are filled in order of increasing energy
What is the maximum number of electrons in the 'd' subshell?
10
What is the term for atoms that have the same number of protons but different numbers of neutrons?
Isotopes
For which elements can the Aufbau principle not be applied directly?
d block elements
Test your knowledge on the basics of atomic structure, including the discovery of protons and the role of electrons in atoms. Learn about the contributions of scientists like Democritus, Eugen Goldstein, and Rutherford.
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