Atom Test

Which of the following statements is true about chemical bonds?

Covalent bonds form from the sharing of electrons between atoms Yes - Covalent bonds form when electrons are shared between the orbitals of two atoms Covalent bonds involve the transfer of one or more electrons from one atom to another. No - Ionic bonds involve the transfer of one or more electrons from one atom to another. When a valence shell is considered to be full, it contains 10 electrons. No - The valence shells of atoms are full when they contain 8 electrons, unless they are atoms of hydrogen or helium (which are filled with fewer than eight) The stability of an atom is independent of the number of electrons contained in its valence shell. No - An atom is closer to having full valence shell is more stable.

A positively charged ion is called which of the following?

Isotope No - Isotopes are versions of the same element that have different numbers of neutrons Cation Yes - Cations are positively charged ions, and anions have a negative charge. Proton No - A proton is a positively charged subatomic particle. Orbital No - An orbital is the location in an atom where electrons circulate.

Which of the following statements is true?

Valence electrons are located in the outer most shell of an atom. Yes - The outermost shell of an atom contains it valence electrons. Orbitals are sets of electron-containing shells No - Shells are sets of electron-containing orbitals Up to four electrons can be held in one orbital No - Up to two electrons can be held in one orbital The number of orbitals that an atom has the same for all elements. No - The number of orbitals that an atom has depends on the number of electrons in that atom.

The atomic number of an element ___________. Which of the following completes the sentence above?

is the combined mass of its protons plus neutrons No - the atomic mass of an element is the combined mass of its protons plus neutrons. varies depending on whether the element is in its solid or liquid state. No - The physical state of an element does not affect its atomic number. is the same as its number of protons in one atom Yes - the number of protons is one atom of an element is the same as its atomic number. does not have any relationship to the order in which the element is listed in the periodic table. No - One way the elements are listed in the periodic table is based on their atomic number.

A proton is _______. Which of the following completes the sentence above?

located in the orbital of an atom No - Protons are located in the nucleus of an atom, and electrons are located in orbitals. a part of an atom that does not have a charge No - Protons have a positive charge a part of an atom that can lose an electron and become negatively charged No - Protons and electrons are oppositely charged parts of an atom. One is not inside of the other. the part of an atom counted to determine the atomic number of an element Yes - The atomic number of an element is the number of protons contained in one of its atoms.