What is the charge of an electron?

Negative

Which model of the atom proposed that electrons are embedded in a positively charged sphere?

Thomson's Plum Pudding Model

Riddle: I am a tiny particle with no charge, found in the nucleus alongside protons. What am I?

Neutron

True or False: The mass of an electron is significant compared to that of a proton.

False. The mass of an electron is negligible compared to a proton.

The maximum number of electrons in the second shell (L-shell) is ______.

8

Which of the following statements about isotopes is true? 

A) Isotopes have different atomic numbers 

B) Isotopes have the same chemical properties 

C) Isotopes have different number of protons 

D) Isotopes are chemically distinct

B) Isotopes have the same chemical properties

What is the term for the outermost electrons in an atom?

Valence electrons

True or False: Bohr's model explains the stability of electrons in all types of atoms.

False. Bohr's model does not explain the spectra of larger atoms.

The atomic number (Z) of an element indicates the number of ______ in its nucleus.

Protons

Which particle was discovered by Chadwick in 1932?

James Chadwick discovered the Neutron

The mass number (A) is calculated as the sum of ______ and ______.

Number of protons and number of neutrons

Which type of particles are α-particles?

Helium ions with a double charge