An element's atomic number is the a. number of protons in an atom's nucleus.
b. weight of the atom.
c. mass of the atom.
d. sum of the protons and neutrons in an atom.
Answers
because two different elements can have the same weight or the sum of protons and neutrons can be the same
but what truely differs an element from another and changes its chemistry, is the proton number
Related Questions
Pedro is baking a cake for his experiment on chemical changes. He knows a chemical change will occur when he puts the cake mixture in the oven. He would like to know what will happen when the cake is removed from the oven. What prediction would you make for Pedro's experiment? A. The chemical changes occurred because the chemicals changed. B. The chemical changes occurred because there was a change in light energy. C. The fruit and the hamburgers were affected by an increase in heat energy. D.The fruit and the hamburgers were affected by a decrease in heat energy.
The molecules CH4 and CH3Cl both have tetrahedral shapes. Why is CH4 nonpolar whereas CH3Cl is polar?
An atom is determined to contain 12 protons, 10 electrons, and 12 neutrons. What are the mass number and charge of this atom or ion? Select one: a. mass number: 24, charge: +2 b. mass number: 22, charge: neutral c. mass number: 34, charge: -2 d. mass number: 34, charge: +2
If a sound wave refracts, what happens to it? Select all that apply.It changes its speed and wavelength when it bounces off of a solid surface.BIt changes direction when it passes through an openingСIt changes its speed and wavelength when it passes through an openingDIt changes direction when it passes from one medium to anotherEIt changes its speed and wavelength from one medium to another.FIt changes direction when it bounces off of a solid surface.
Answers
Potassium sulphide has the chemical formula S .
What do you mean by Chemical formula ?
A chemical formula is a phrase that lists the constituent parts of a compound together with their relative proportions. No subscript is used if there is just one atom of a certain kind.
Alkali metals in Group 1A produce plus-one ions because they wish to give up their valence electron in their outer shell.
In order to have a complete octet in its outermost shell, sulphur, which is found in the chalcogens, needs to gain two electrons.
Thus, Potassium sulphide has the chemical formula S .
To learn more about Chemical formula, refer to the below link:
# SPJ2
Answers
2 NaOH (s) + CO₂ (g) → Na₂CO₃ (s) + H₂O (l)
Explanation:
The most probably chemical reaction is:
2 NaOH (s) + CO₂ (g) → Na₂CO₃ (s) + H₂O (l)
Sodium Hydroxide (solid) + Carbon Dioxide (gas) → Sodium Carbonate (solid) + Water (gas)
In this reaction the water you obtain have to be in liquid form because the reaction takes place at room temperature. However because the student left the beaker for 24 hours, the water have a plenty of time to evaporate, so in the end only sodium carbonate (Na₂CO₃) remained in the beaker.
number of moles = mass / molar weight
number of moles of NaOH = 0.4 / 40 = 0.01 moles
Taking in account the chemical reaction, we devise the following reasoning:
if 2 moles of NaOH produce 1 mole of Na₂CO₃
then 0.01 moles of NaOH produce X mole of Na₂CO₃
X = (0.01 × 1) / 2 = 0.005 moles of Na₂CO₃
mass = number of moles × molar weight
mass of Na₂CO₃ = 0.005 × 106 = 0.53 g
mass of Na₂CO₃ = mass of beaker and its contents after 24h - mass of empty beaker
mass of Na₂CO₃ = 113.09 - 112.58 = 0.51 g which is close the theoretical value of 0.53 g.
Learn more about:
number of moles
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Answers
Beta and Gamma radiation are the most dangerous because they can penetrate the skin, and damage the cells inside.
Alpha is the least dangerous.
B. An electron has a neutral electrical charge.
C. An electron is much larger than an atom.
D. An electron is located inside the nucleus of an atom.
Answers
Answer: Option (A) is the correct answer.
Explanation:
An atom consists of three sub atomic particles. These particles are protons, electrons and neutrons.
Protons have a positive charge. Whereas neutrons have no charge. On the other hand, electrons have a negative charge.
Thus, we can conclude that out of the given options, an electron has a negative electrical charge is the correct statement.
Answers
6(1.00728 amu) + 6 (1.00866 amu) = x
6.04368amu + 6.05196 amu = x
12.09564amu = x
Thensubtract it with 12 amu to get the defect mass
12.09564amu - 12.00000 amu = y
0.09564amu = y
So thedefect mass would be 0.09564 amu.
Answer:
6
6
0.09564
Explanation:
Just did it my fellow people of the planet Earth.
Answers
The right answer is D. all of the above.
The restoration and rehabilitation of wetlands are today major challenges to maintain a fabric of natural spaces with high heritage value. The ecological engineering that has developed over many years, inspired by methods of renaturation of coastal, alluvial, grassland and forest natural areas has specificities that it is necessary to share to allow access to the greatest number. This knowledge is built on the basis of feedback and scientific knowledge, which is itself constantly evolving. They constitute a base for conducting sustainable operations that are consistent with the maintenance of ecological trajectories as close as possible to the natural model in balance with human activities.
all the option have positive outcomes; benefit the economy by providing jobs, specifically it contributes welfare to the society. Improve wildlife populations, when you say improvement there is an additional change that makes something better or valuable. Reduce soil erosion and flooding in coastal areas; we cannot avoid it but we can prevent the destructive effect of this in our lives. Being prepared from those sudden change can restore wetlands and forests not just along the coast as well as to other areas.