Bio 264:2.1 Matter

What type of bonds form from the unequal sharing of electrons? Hydrogen Ionic Polar covalent Nonpolar covalent Electrostatic

Polar covalent

Which statement is true regarding protons? Protons are found in the nucleus. Protons are the only subatomic particle with a charge. All elements have the same number of protons. Protons don't have a specific location in the atom. Rather, they are found in orbitals and energy shells.

Protons are found in the nucleus.

If boron atoms have 5 electrons, how many electrons are in the outer electron shell of a boron atom? 1 2 3 4 5

3

Two nitrogen atoms are measured and weighed. The atomic number of nitrogen is 7 and we find that the first nitrogen atom has an atomic mass of 14, while the second nitrogen atom has an atomic mass of 13. Which of the following statements are true about the nitrogen atoms? They have the same number of neutrons but a different number of electrons. We have found an isotope. The two atoms have the same number of protons but a different number of neutrons. Both A and B Both B and C All of the above.

Both B and C

What is true of a double covalent bond? Double covalent bonds are always polar covalent bonds Double covalent bonds are formed between two ions Double covalent bonds share two pairs of electrons Double covalent bonds are a subtype of hydrogen bonds

Double covalent bonds share two pairs of electrons

Which of the following statements is true? Neutrons have no mass. Electrons are associated with the center of the atom, or nucleus. Protons have a large mass compared to neutrons. Having the right number of neutrons is an essential part of having a stable nucleus.

Having the right number of neutrons is an essential part of having a stable nucleus.

Which statement is correct? If the mass number of an atom changes, it becomes either an anion or a cation. The mass number tells us how many protons are in the nucleus of that element. If you change the mass number but not the atomic number, you are creating an isotope. The atomic number tells us the total number of protons, neutrons, and electrons that are associated with an element.

If you change the mass number but not the atomic number, you are creating an isotope.

For the Element U235 92 , which statement is correct? It has 235 Protons It has 235 Neutrons It has 143 Neutrons It has 143 electrons

It has 143 Neutrons

If you were an electron, and your hometown was your nucleus, what would you need to do in relation to your home town to emit light (release energy)? Knock down your previous house and build a bigger one. Move closer to your hometown. Move further away from your hometown. Stay where you are but speed up your daily life.

Move closer to your hometown.

Which statement is false regarding ionic bonds? A cation is an ion with a positive charge. Neon and argon would form an ionic bond because they both have full electron shells. In an ionic bond, one atom has less electrons than protons and one atom has more electrons than protons. In an ionic bond, the ions are trying to fill their electron shells and that is what attracts them to each other.

Neon and argon would form an ionic bond because they both have full electron shells.

How many electrons are in the outer most energy shell for a potassium atom? Three electrons One electron Five electrons Two electrons

One electron

An interaction between two polar molecules where a partial-positive charged hydrogen atom of one molecule is attracted to the partial-negative charge of a nitrogen atom of the other molecule is called . a covalent bond an ionic bond a hydrogen bond a congenial bond

a hydrogen bond

A cation is . an uncharged atom or molecule a positively charged atom or molecule a negatively charged atom or molecule an atom or molecule that has gained an electron

a positively charged atom or molecule

Which unit do we use to define the weight of atoms? amu mol lb g

amu

Bonds that share electrons are called , whereas bonds that have a complete electron transfer are called . ionic, covalent hydrogen, ionic intermolecular, ionic covalent, ionic

covalent, ionic

Which particles of the atom are found in orbitals that make up different energy shells? Electrons Protons Neutrons Cations

electrons

An element with six electrons in its outer shell will want to . gain two electrons lose six electrons gain one electron stay the same; six electrons fills it's outer orbital

gain two electrons

Molecules that form when electrons are shared unequally between atoms are called . salt molecules polar molecules nonpolar molecules lopsided molecules none of the above

polar molecules

Which subatomic particle determines the atomic number? Electron Proton Neutron Nucleus

proton

In a covalent bond, the electrons are . shared by two atom given away by one atom to another atom kept by both atoms not relevant to covalent bonds

shared by two atom