Metals and

Krypton is named after the Greek word that means "secret." Which explains why krypton was most likely given this name? Krypton is a halogen, so it is a secret element because it is always part of a compound and is difficult to find by itself. Krypton is a halogen, so it should be kept secret because it is so reactive and toxic. Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret. Krypton is a noble gas, so it secretly bonds with every type of element without showing it.

Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.

Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two different metals? Barium (Ba) is less reactive than calcium (Ca) because the valence electrons in calcium atoms are farther from the nuclei and harder to remove. Strontium (Sr) is more reactive than magnesium (Mg) because the valence electrons in strontium atoms are farther from the nuclei and harder to remove. Rubidium (Rb) is more reactive than sodium (Na) because the valence electrons in sodium atoms are closer to the nuclei and easier to remove. Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove.

Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove.

Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two metals? Rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons. Sodium (Na) is more reactive than magnesium (Mg) because sodium atoms must gain more electrons. Calcium (Ca) is less reactive than potassium (K) because potassium atoms must lose more electrons. Beryllium (Be) is less reactive than lithium (Li) because beryllium atoms must gain more electrons.

Rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons.

Looking at the same nonmetal group on the periodic table, how does the reactivity of an element in period 2 compare to the reactivity of an element in period 4? The period 2 element would be more reactive because the attractive force of protons is stronger when there are fewer neutrons interfering. The period 2 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a closer electron shell. The period 4 element would be more reactive because the attractive force of protons is stronger when there are more neutrons helping. The period 4 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a farther electron shell.

The period 2 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a closer electron shell.

Atoms of elements at the top of a group on the periodic table are smaller than the atoms of elements at the bottom of the group. How does this help explain the difference in the reactivity of metals within a group? The valence electrons of the larger atoms are farther from the nucleus and are easier to remove, so the metals near the top are more reactive than those at the bottom. The valence electrons of the larger atoms are farther from the nucleus and are harder to remove, so the metals near the bottom are more reactive than those at the top. The valence electrons of the larger atoms are farther from the nucleus and are harder to remove, so the metals near the top are more reactive than those at the bottom. The valence electrons of the larger atoms are farther from the nucleus and are easier to remove, so the metals near the bottom are more reactive than those at the top.

The valence electrons of the larger atoms are farther from the nucleus and are easier to remove, so the metals near the bottom are more reactive than those at the top.

Which statement best explains why radon and krypton do not bond easily with other elements? They have many electron shells, so their protons do not attract electrons strongly. They have eight electrons in their valence shells, so they are stable without gaining or losing electrons. Their valence shells are empty, so they do not need to bond with other elements to be more stable. Their valence shells are so close to the protons in the nucleus that bonding cannot happen like in other elements.

They have eight electrons in their valence shells, so they are stable without gaining or losing electrons.

Which element has a complete valence electron shell? selenium (Se) oxygen (O) fluorine (F) argon (Ar)

argon (Ar)

Where are the most reactive nonmetal elements found on the periodic table? at the top of group 17 at the bottom of group 17 at the top of group 18 at the bottom of group 18

at the top of group 17

Which element is likely to be the most reactive? bromine (Br) chlorine (Cl) fluorine (F) iodine (I)

fluorine (F)

When looking across the periodic table from left to right, which of these groups are the first to contain nonmetals? group 2 group 7 group 14 group 18

group 14

Which describes any compound that has at least one element from group 17? halide noble gas metalloid transition metal

halide

A student is working with four different solid substances: sodium (Na), calcium (Ca), copper (Cu), and iodine (I). Which substance is most likely to break easily into many smaller pieces? sodium calcium copper iodine

iodine

Each year, the science club puts on a science show for the students in the elementary school. Luis is planning demonstrations to show properties of metals. For one property, he decides to use a ball of pizza dough and a rolling pin. Which property of metals is Luis most likely going to demonstrate using these materials luster opacity conductivity malleability

malleability

Which property of metals allows aluminum to be flattened into thin sheets of aluminum foil? shininess malleability brittleness hardness

malleability

Metals are used in many products because of the characteristic properties that most metals have. Which product requires the high luster of metals in order to work? mirrors pots and pans food wrap circuit boards

mirrors

Based on its location on the periodic table, which metal is likely to be less reactive than rubidium and more reactive than calcium? potassium (K) cesium (Cs) magnesium (Mg) titanium (Ti)

potassium (K)

Chromium, calcium, and potassium are near each other on the periodic table and have some common characteristics but differ in chemical reactivity. Which lists these metals in order from most reactive to least reactive? calcium, chromium, potassium chromium, calcium, potassium potassium, calcium, chromium potassium, chromium, calcium

potassium, calcium, chromium

Cecil is working with samples of chlorine (Cl), oxygen (O), bromine (Br), and silver (Ag). The samples are all at room temperature. Which substance is most likely the most dense? chlorine oxygen bromine silver

silver

An atom of element X has one more shell of electrons than an atom of beryllium, but it has one less valence electron than beryllium. Which element is element X? sodium (Na) boron (B) magnesium (Mg) lithium (Li)

sodium (Na)

Which metal in Period 5 is very reactive and has two valence electrons in each atom? rubidium (Rb) strontium (Sr) zirconium (Zr) silver (Ag)

strontium (Sr)