Unit 3 Practice 24-25

Front

What type of decay is shown in this equation?

Back

Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (2 protons and 2 neutrons), resulting in a new element with a lower atomic number.

Front

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

Back

Atoms are the basic units of matter and the defining structure of elements.

Front

What is the atomic structure of Osmium with 76 protons and 114 neutrons?

Back

Osmium-190 is the isotope of Osmium with a total of 190 nucleons (76 protons + 114 neutrons).

Front

Who performed the Gold Foil Experiment?

Back

Ernest Rutherford conducted the Gold Foil Experiment, which led to the discovery of the atomic nucleus.

Front

What is the atomic structure of Fluorine with 9 protons and 9 neutrons?

Back

Fluorine-18 is the isotope of Fluorine with a total of 18 nucleons (9 protons + 9 neutrons).

Front

Define alpha decay.

Back

Alpha decay is a process by which an unstable atomic nucleus loses energy by emitting an alpha particle.

Front

What is the significance of Dalton's Atomic Theory?

Back

Dalton's Atomic Theory laid the foundation for modern chemistry by proposing that matter is made of atoms, which are indivisible and combine in fixed ratios.

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

Explain the concept of atomic number.

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus by offsetting the repulsive forces between protons.