Mohamed is learning about the nucleus. He understands that the nuclear force holds the nucleus together. Why is the nuclear force necessary?

Which shell is closest to the nucleus?

The smallest particle of an element that retains its properties is:

Particles of matter are always in:

According to modern atomic theory, electrons behave as:

Fatima is studying the Heisenberg uncertainty principle. She learns that it states that we cannot know both the position and momentum of an electron with complete certainty. This principle applies to which model of the atom?

Which subatomic particle has a positive charge?

George is reviewing atomic structure. He knows that atoms consist of subatomic particles. Which of the following is NOT a subatomic particle found in an atom?

Bongani is studying the postulates of Rutherford's atomic model. He learns that Rutherford proposed that the nucleus is positively charged. What did he conclude about the size of the nucleus?

Who discovered the nucleus?

Fatima is reviewing atomic structure and subatomic particles. She knows that electrons are found outside the nucleus. What is the approximate mass of an electron compared to a proton?

Waleed is learning about the relationship between subatomic particles. He knows that protons and neutrons have almost equal mass. What is the approximate relative mass of a proton?

David is studying Bohr's atomic model. He learns that Bohr proposed specific orbits for electrons. What is a key postulate of Bohr's model?

Bilal is studying Rutherford's atomic model. He learns that Rutherford conducted the gold foil experiment. Based on Rutherford's model, what did he conclude about the atom?

Laura is studying symbols for ions. She sees the symbol O2-. What does this indicate?

Electrons revolve around the nucleus in:

Carlos is analyzing the defects of Bohr's atomic model. He learns that Bohr's model could not explain the spectra of atoms with more than one electron. What is the main reason for this defect?

The study of atomic structure helps to understand:

Which subshell has spherical shape?

The maximum number of electrons in the first shell is:

The modern atomic model explains:

Mohamed is learning about isotopes. He understands that isotopes are atoms of the same element with different mass numbers. What is the reason for this difference?

Which concept explains why atoms are stable?

Samir is learning about cations. He knows that sodium forms a cation with a +1 charge. How does sodium achieve this charge?

Nadia is studying isotopes of carbon. She learns that carbon-12 and carbon-14 are isotopes. What is the difference between carbon-12 and carbon-14?

Which subatomic particle has a negative charge?

Usman is learning about electronic configuration. He understands that electrons are arranged in shells around the nucleus. What is the maximum number of electrons in the first shell (n=1)?

Chloe is analyzing the defects of Rutherford's atomic model. She learns that it could not explain certain phenomena. What was a major defect of Rutherford's model?

Ibrahim is studying the behavior of electrons in an electric field. He learns that electrons are deflected towards the positive plate. What does this indicate about the electron?

Khalid is learning about sub-shells. He knows that the s sub-shell can hold a maximum of 2 electrons. How many electrons can the d sub-shell hold?