8.5A Atomic Structure 7th

Which statement accurately describes the atoms of a specific element?

• An Indium (In) atom contains 115 protons inside the nucleus, and 49 neutrons outside the nucleus

• A Scandium (Sc) atom contains 45 electrons outside the nucleus, and 21 neutrons inside the nucleus

• An Aluminum (Al) atom contains 27 electrons and 27 protons inside the nucleus

• A Zinc (Zn) atom contains 30 protons inside the nucleus, and 30 electrons outside the nucleus

Which statement correctly describes the location and charge of the electrons in an atom?

• Electrons are located inside the nucleus and have no charge

• Electrons are located outside the nucleus and have no charge

• Electrons are located inside the nucleus and have a negative charge

• Electrons are located outside the nucleus and have a negative charge

What is the total number of protons, neutrons, and electrons in a Cadmium atom if that has a mass number of 112

• 112

• 48

• 64

• 160

What is the difference between the number of electrons in an atom of Selenium (Se) which has an atomic number of 34, and the number of electrons in an atom of Aluminum (Al) which has an atomic number of 13

• there is no difference

• 21

• there is not enough information to answer this question

• 47

How many protons, neutrons, and electrons are present in an atom of Hafnium (Hf) with a mass number of 178

• 72 protons, 178 neutrons, 106 electrons

• 72 protons, 106 neutrons, 72 electrons

• 178 protons, 250 neutrons, 72 electrons

• 106 protons, 72 neutrons, 106 electrons

An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom?

• 36

• 84

• 72

• 48

In the early 1900's many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Earnest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty space with _________.

• protons orbiting a dense nucleus made of electrons

• electrons orbiting a dense nucleus made of protons and neutrons

• neutrons and protons orbiting a cloud of electrons

• electrons and protons orbiting a cloud of neutrons

What types of particles are found in the cloud surrounding the atom's nucleus?

• Positively charged particles and negatively charged particles

• Negatively charged particles only

• Neutral particles and positively charged particles

• Positively charged particles only

What is the mass of Potassium (K) atom that has 20 neutrons

• 18

• 19

• 20

• 39

Which of the following best describes an electron?

• It has no charge and about the same mass as a proton

• It has a negative charge and much less mass than a proton

• It has a positive charge and much more mass than a neutron

• It has a negative charge and about the same mass as a neutron