Synthesis of Artificial Elements

Which of the following best defines isotopes?

• Variants of chemical elements with the same number of protons and electrons, but a different number of neutrons.

• Variants of chemical elements with different numbers of protons and electrons, but the same number of neutrons.

• Variants of chemical elements with the same number of neutrons and electrons, but a different number of protons.

• Variants of chemical elements with different numbers of protons, neutrons, and electrons.

Which isotope of hydrogen has two neutrons?

• Hydrogen-1

• Hydrogen-2 (deuterium)

• Hydrogen-3 (tritium)

• Hydrogen-4

According to current theories, when were the first atomic nuclei formed?

• A few minutes after the Big Bang

• Billions of years after the formation of stars

• Immediately after the formation of atoms

• During the cooling of the universe

What is an important step after synthesizing a new element in a chemical reaction?

• Explaining how the new element is identified

• Disposing of the reaction mixture

• Heating the reaction mixture

• Adding more reactants

If an element has an atomic number of 7, what can you infer about its atomic structure?

• It has 7 protons

• It has 7 neutrons

• It has 7 electrons and neutrons

• It has a mass of 7

Which scientist is credited with arranging the elements in the Periodic Table based on their atomic masses/weights in 1869?

• Dmitri Mendeleev

• Marie Curie

• John Dalton

• Albert Einstein

Which atomic numbers corresponded to the gaps predicted by X-ray spectroscopy in the periodic table?

• 43, 61, 85, and 87

• 12, 24, 56, and 78

• 10, 20, 30, and 40

• 15, 25, 35, and 45

Who was the British physicist that performed the first successful nuclear transmutation in 1919?

• Albert Einstein

• Ernest Rutherford

• Niels Bohr

• Marie Curie

What is nuclear transmutation?

• The splitting of an atom into smaller parts

• A reaction that changes one element or isotope into another element

• The combination of two nuclei to form a heavier nucleus

• The emission of light from a nucleus

According to the provided nuclear equation, what is produced when nitrogen-14 is bombarded with an alpha particle?

• Oxygen (O)

• Carbon (C)

• Helium (He)

• Neon (Ne)