1)
-Lithium: Lithium got 3 protons, so it atomic number is 3. It is located on the first column of the periodic table, and belonging to the alkali metal. So lithium is a metal. Lithium is highly reactive.
-Neon: It is located on the 18th column of the periodic table, and belong to the noble gases. So Neon is a nonmetal. Neon's reactivity is very low.
-Fluorine: Located on the 17th column of the periodic metal, fluorine is a nonmetal, and belong to the halogen family. Fluorine's reactivity is high.
2)
-Vertical columns of the periodic table are called columns. There is 18 column in the periodic table, and each one represent a chemical family.
-Horizontal rows of the periodic table care called periods. There is 7 periods in the periodic table.
-The number of protons in an atom is that element's atomic number. And since the atom is electrically neutral, the number of protons is equal to the number of electrons. So if you have the number of electrons, you can still find the atomic number.
-The total of protons and neutrons in an atom is that element's atomic mass. Based on the formula A = Z + N, where A represents the atomic mass, Z the atomic number (number of protons) and N the number of neutrons.
-The elements in group 1 are the most reactive metals. This group is called the Alkali metals. They only have 1 electron in their outer shell which makes them always ready to lose an electron in an ionic bonding.
-The elements in group 17 are the most reactive nonmetals. This group is called the Halogens, with 7 electrons in their outer shell which makes them always ready to win an electron in an ionic bonding.
-The elements in group 18 are the most unreactive elements. This group is called the Noble gases. Their outer shell is always full, so it can't do reactions.
Hope this Helps! :)
False heat rises upwards therefore the hottest part of the sun would be upwards
D for sure hope this helps
Answer:
To monitor Pressure increase
Explanation:
the more pressure, the higher the production of the gas, which can be recorded, more pressure meaning higher production. Then vary the temperature.
Answer:
The compound has a molar mass of 78.4 g/mol
Explanation:
Step 1: data given
Mass of a sample = 0.5 grams
Mass of benzene = 25 grams
Freezing poing = 5 °C
Kf of benzene = 5.1 °C/m
Freezing point solution = 3.7 °C
Step 2: Calculate molality
ΔT = i*Kf*m
⇒with ΔT = the freezing point depression = 5.0 - 3.7 = 1.3 °C
⇒with i = the can't hoff factor = 1
⇒with Kf = the freezing point depression constant of benzene = 5.1 °C/m
⇒with m = the molality
1.3 = 5.1 * m
m = 1.3 / 5.1
m = 0.255 moles /kg
Step 3: Calculate moles
Molality = moles / mass benzene
0.255 molal = moles / 0.025 kg
Moles = 0.255 molal * 0.025 kg
Moles = 0.006375 moles
Step 4: Calculate molar mass of the compound
Molar mass compund = mass / moles
Molar mass compound = 0.5 grams / 0.006375 moles
Molar mass compound = 78.4 g/mol
The compound has a molar mass of 78.4 g/mol
