science

choose the name of the scientist who rearrangedthe elements into increasing atomic number

• glenn seaborg

• henry moseley

• aristotle

• antoine lavoisier

explain why group 1 elements are the most metallic family of elements?

• group 1 elements easily lose electrons

• group 1 elements easily gain electrons

• group 1 elements have ns2 configuration

• group 1 elements have ns2 np5 configuration

transition metals and their compounds are often used as catalysts in industrial processes. justify why is that so?

• they are cheap and abundant

• they have partially- filled d-subshell

• they formed colored compounds which can be easily seperated from the reagents in reactions

• they have high melting and boiling point which make them suitable for the high temperatures of industrial processes

examine the following set of elements and determine which group is composed of noble gases

• au, ag, pt, pb

• h2, n2, o2, f2

• he, ne, ar, xe

• f2, c12, br2, n

elements in the same group have the same number of _______

• protons

• electrons

• neutrons

• valence electrons

which statement about the reactivity of these metals is correct

• zinc is less reactive than iron

• sodium is less reactive than calcium

• copper is more reactive than potassium

• calcium is more reactive than magnesium

based on the reactivity series, which metal is the most reactive

• copper

• iron

• sodium

• zinc

which of the following sets of metals is arranged according to increasing reactivity

• K,Mg,Na,Ca

• Mg, Ca, Na, K

• Mg,Na,Ca,K

• Na, Ca, Mg, K

compare and contrast the following materials. which metal is preffered to be used for water pipes due to its highly corrosion resistant in most underground environments?

• iron

• gold

• copper

• pottasium

lithium, sodium, and potassium are group 1 metals. a teacher wanted to demonstrate the similarities and differences in how each metal reacted. she added a piece of each metal to a trough water. predict what you would see when metal is added to water. creating

• all three metals sink

• they are stable

• gas bubbles are not observed

• reactivity increases down the group