Answer: the answer is C!
Thallium consists of 29.5%Th-203 and 70.5%Th-205. What is the relative atomic mass of thallium?
204.41 is the relative atomic mass of thallium.
Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.
Formula used to calculate average atomic mass follows:
We are given:
Mass of Thallium-203= 203 u
Percentage abundance of Thallium-203= 29.5%
Fractional abundance of Thallium-203= 0.295
Mass of Thallium-205 = 270.9 u
Percentage abundance of Thallium-205 = 70.5%
Fractional abundance of Thallium-203 = 0.705
Putting values in equation 1, we get:
204.41 is the relative atomic mass of thallium.
Why is liquid silver less dense than solid silver
Liquid silver is less dense than solid silver due to the density between these two species.Density:
It is defined as the ratio of mass over volume. The same mass divided by a larger volume results in a smaller value for density. Therefore, liquid silver is less dense than solid silver. The density of solids usually decreases slightly as temperature increases because solids expand when heated. The vibrations of the molecules increases, and it is easier for the molecules to slide past each other.
Find more information about Density here:
The same mass divided by a larger volume results in a smaller value for density. Therefore, liquid silver is less dense than solid silver. Temperature and solid density The density of solids usually decreases slightly as temperature increases because solids expand when heated.
Hope this helps
-A Helping Friend (mark brainliest pls)
What volume (in liters) does 3.91 moles of nitrogen gas at 5.35 atm and 323 K occupy
Calculate the number of protons, electrons, and neutrons in an atom of the element Pb with mass number 207 and atomic number 82. # P=
Let be the number of protons.
Let be the number of electrons.
Let be the number of neutrons.
Atomic number is defined as the number of protons in a atom or ion.
Given,atomic number is .
Since the atom is electrically neutral,number of protons and electrons are equal.
The atomic mass is the sum of neutrons and protons.
What determines an element's chemical properties
An element's chemical properties are determined by the number of electrons .How do electrons determine chemical properties?
The number of electrons determine chemical properties of an atom as they are present in equal number outside the nucleus as that of protons .Protons contribute to the mass of an atom and give an identity to an atom .
As protons are positively charged there is a need to balance this positive charge and it is balanced by an equal number of electrons .As the valence electrons are the electrons which take part in chemical reactions the element's chemical properties are determined by the number of electrons.
The number of neutrons has a negligible effect on the chemical nature of elements as they are neutral and have no charge.Indirectly, it's the electronic configuration of an element which determines the chemical properties of any element.
To learn more about chemical properties of elements click here:
(c2h5)2 CH (cH2)3 ch(ch3)2
IUPAC name please?!
6-ethyl 2-methyl octane
The compound here is 6-ethyl 2-methyl octane.
The longest chain here is octane with 8-carbon atoms. On the sixth carbon atom, we have a substituent group which is an ethyl. The second carbon atom has methyl group.
Note: The direction of the numberng is chosen such that the lowest numbers possible are given to the branches or substituents.
Most minerals do not split evenly. Instead, they have a characteristic type of
Covalent bonds are formed in order to: completely fill the shells of the atoms fill the s and p subshells of the outer shell form ions which attract each other other
completely fill the shells of the atoms
Covalent bonds are interatomic bonds which results from the sharing of electrons between two or more atoms. Each of the atoms tends to share the valence electrons in their outer energy levels to be able to mimic the structure of the noble gases.
Usually, this bond type results from two atoms whose electronegativity difference is very low or even zero.
fill the s and p subshells of the outer shell
Look at the graph below. Will mark brainliest A graph is shown with Absolute Brightness shown on y axis and Surface temperature in degree Celsius shown on x axis. The Dwarf stars are shown along a slanting line from coordinates 30,000 and minus 3 to 10,000 and minus 4. The Main Sequence stars are shown along a slanting line from coordinates 20,000 and minus 2 to 2,000 and minus 6. The giants are shown along a line parallel to the x axis from coordinates 5,000 and 2 to 2,000 and 3. The supergiants are shown along a line parallel to the x axis from coordinates 7,500 and 4 to 2,500 and 4. Point A has coordinates 20,000 and minus 4. Point B has coordinates 2,500 and minus 4. Point C has coordinates 5,000 and 2. Point D has coordinates 7,000 and 4.
Which of the following stars is most likely to be blue?
Based on the information provided, we can determine that the color of a star is related to its surface temperature, with hotter stars appearing more blue and cooler stars appearing more red.
Looking at the graph, we can see that the stars along the left side of the graph (with negative values on the x-axis) are hotter than the stars on the right side of the graph. Therefore, Star A, which has coordinates of 20,000 and -4, is hotter than Star B, which has coordinates of 2,500 and -4.
Comparing the coordinates of Star A to the lines representing the different types of stars, we can see that it falls on the line for main sequence stars. Main sequence stars are typically white or blue-white in color, so Star A is most likely to be blue.
Mark me brainliest