ALEKS Test Question with 100% Verified
Answers
electron (symbol, charge, mass, location)
e-, -1, .000549 amu or 1/1800 amu, orbiting around nucleus
proton (symbol, charge, mass, location)
p+, +1, 1.0 amu, nucleus
Neutron (symbol, charge, mass)
N0, 0, 1.0 amu
ecide which element probably has a density most and least similar to the density of
rubidium.
options are fluorine, cesium, thallium, & indium.
Metals are more similar to each other than they are to nonmetals.
Likewise, nonmetals are more similar to each other than they are to metals.
Elements in the same group of the Periodic Table are most similar to each other
You can use the Periodic Table to find out that rubidium, cesium, thallium, and indium are all
metals, while fluorine is a nonmetal. That means fluorine is going to be least similar to
rubidium. To choose whether cesium, thallium, or indium is more similar to rubidium,
compare their positions in the Periodic Table:
You can see that cesium is in the same group (Group 1A) as rubidium, while thallium and
indium are in another group (Group 3A). That means cesium is going to be most similar to
rubidium.
, In the table below, there are descriptions of an experiment on samples of three different
chemical elements. Decide whether the element is a metal or nonmetal, if you can. If
there is not enough information to decide, choose can't decide in the third column.
1. Element 1 is a shiny silvery-gray solid. A
10.g cube of it is set on a hot plate. After
10 minutes, the temperature of the top of the cube has risen by less than 1°C.
2. Element 2 is a moderately soft silvery-gray solid. A small
×2cm×2cm2cm cube of it is put into a hydraulic press and squeezed until it is half as
thick. When the sample is inspected, it has broken into many smaller pieces. Where the
sample broke, the fresh surfaces are lighter in color.
3. Element 3 is a hard silvery-gray solid. A ×5cm5cm
square of it, only 1mm
thick, is flexed slightly by hand, putting a slight bend in the middle of the square.
The goal here is to learn to tell metals from nonmetals by studying a description of their
macroscopic physical properties. (Metals also differ from nonmetals in their chemical
properties.)
There are three major types of difference you'll find useful:
1. Every metal except mercury Hg
is a solid at room temperature and pressure. (Mercury is a heavy metallic-silver liquid that
freezes at about
−38°C.) All elements that are gases at room temperature and pressure, and the one other
element that is a liquid (bromine), are nonmetals.
Answers
electron (symbol, charge, mass, location)
e-, -1, .000549 amu or 1/1800 amu, orbiting around nucleus
proton (symbol, charge, mass, location)
p+, +1, 1.0 amu, nucleus
Neutron (symbol, charge, mass)
N0, 0, 1.0 amu
ecide which element probably has a density most and least similar to the density of
rubidium.
options are fluorine, cesium, thallium, & indium.
Metals are more similar to each other than they are to nonmetals.
Likewise, nonmetals are more similar to each other than they are to metals.
Elements in the same group of the Periodic Table are most similar to each other
You can use the Periodic Table to find out that rubidium, cesium, thallium, and indium are all
metals, while fluorine is a nonmetal. That means fluorine is going to be least similar to
rubidium. To choose whether cesium, thallium, or indium is more similar to rubidium,
compare their positions in the Periodic Table:
You can see that cesium is in the same group (Group 1A) as rubidium, while thallium and
indium are in another group (Group 3A). That means cesium is going to be most similar to
rubidium.
, In the table below, there are descriptions of an experiment on samples of three different
chemical elements. Decide whether the element is a metal or nonmetal, if you can. If
there is not enough information to decide, choose can't decide in the third column.
1. Element 1 is a shiny silvery-gray solid. A
10.g cube of it is set on a hot plate. After
10 minutes, the temperature of the top of the cube has risen by less than 1°C.
2. Element 2 is a moderately soft silvery-gray solid. A small
×2cm×2cm2cm cube of it is put into a hydraulic press and squeezed until it is half as
thick. When the sample is inspected, it has broken into many smaller pieces. Where the
sample broke, the fresh surfaces are lighter in color.
3. Element 3 is a hard silvery-gray solid. A ×5cm5cm
square of it, only 1mm
thick, is flexed slightly by hand, putting a slight bend in the middle of the square.
The goal here is to learn to tell metals from nonmetals by studying a description of their
macroscopic physical properties. (Metals also differ from nonmetals in their chemical
properties.)
There are three major types of difference you'll find useful:
1. Every metal except mercury Hg
is a solid at room temperature and pressure. (Mercury is a heavy metallic-silver liquid that
freezes at about
−38°C.) All elements that are gases at room temperature and pressure, and the one other
element that is a liquid (bromine), are nonmetals.
