Count the number of neutrons in Cesium-130/55 (Cs) A. 55 B. 75 C. 130 D. 185
Answers
the given element is
¹³⁰₅₅Cs
the superscript - 130 is the atomic mass / mass number
mass number is the sum of protons and neutrons
subscript - 55 is the atomic number
atomic number is the number of protons
therefore we can write the following equations
protons = 55
protons + neutrons = 130
so neutrons = 130 - protons
nuetrons = 130 - 55 = 75
number of neutrons = 75
Related Questions
A scientist thinks that ducks swim faster when they are in cold water. He tests two groups of ducks, one in cold water and one in room temperature water. He records how fast they swim.Experimental Group:Control Group:
Which element is rolled into a foil found and used in your kitchen?
Which factors are needed for organisms to live earth
Which group of atomic models is listed in historical order from the earliest to the most recent?(1) hard-sphere model, wave-mechanical model, electron-shell model (2) hard-sphere model, electron-shell model, wave-mechanical model (3) electron-shell model, wave-mechanical model, hard-sphere model (4) electron-shell model, hard-sphere model, wave-mechanical model
Answers
(1) H2
(2) N2
(3) O2
(4) F2
Answers
Answer: (2)
Explanation:
1) is a diatomic molecule which is formed by sharing of two electrons between two hydrogen atoms.
2) is a diatomic molecule which is formed by sharing of six electrons between two nitrogen atoms.
3) is a diatomic molecule which is formed by sharing of four electrons between two oxygen atoms.
4) is a diatomic molecule which is formed by sharing of two electrons between two fluorine atoms.
two atoms share six electrons would be N2. It has five valence electrons, so it needs three more valence electrons to complete its octet.
Answers
The correct scientific notation form of the number 5,489.6654 using only 2 significant figures is: 5.5 * 10³
What is scientific notation
Scientific notation is a way to represent very large or very small numbers in a more concise and manageable format. It consists of two parts: a coefficient and an exponent of 10.
In your given number, 5,489.6654, we want to express it in scientific notation using only 2 significant figures. Significant figures are the digits in a number that contribute to its precision.
Identify the significant figures: From the given number, we have two significant figures, which are 5 and 4.
Determine the coefficient: To represent the number in scientific notation, we want the coefficient to be between 1 and 10. In this case, we can round the number to 5.5 (rounding the 8 up).
Determine the exponent of 10: To express the number 5.5 in scientific notation, we need to move the decimal point in the original number to the right by one place.
Learn more about scientific notation
#SPJ3
Answer:
5.4 × 10^3.
Explanation:
Not 5.49 × 10^3, 5.4 × 10^7, or 5.5 × 10^3.
Answers
Answer:
The correct answer is red-sensitive nerves.
Explanation:
The individuals with protanopia do not possess the tendency to sense red light, the individuals with tritanopia do not sense blue light, and the individuals with deuteranopia do not sense green light. If an individual is perceiving green color then in that case, the yellow sensitive nerves must function somewhat efficiently as green is an amalgamation of blue and yellow. Thus, the red-sensitive nerves would not be reacting appropriately for this individual.
B. 6.5
C. 7.7
D. 6.29
Answers
Answer:
A. 8.4
Explanation:
[OH⁻] = 2.6 × 10⁻⁶ Take the negative log of each side
-log[OH⁻] = pOH = 5.59 Apply the pH/pOH relation
pH + pOH = 14.00 Insert the value of pOH
pH + 5.59 = 14.00 Subtract 5.59 from each side
pH = 14.00 -5.59 = 8.41
True
False
A perpetual motion machine is an invention that has only worked a few times in history.
True
False
Thermal pollution occurs when factories use water to cool down their heated machinery, and then release the heated water into rivers and oceans.
True
False
Answers
true
false
i hope that helps too
hopefuly...........