The nuclear symbol for uranium-235 should be written asO U-235.
225
92 U
233
143U
OU
Answers
Answer:
²³⁵₉₂U
Explanation:
The right symbol for the nuclei is ²³⁵₉₂U;
For this chemical element, the atom is represented by the symbol U;
To the superscript before the symbol is the mass number
The subscript before the symbol is the atomic number
Mass number is the number of protons and neutrons
Atomic number is the number of protons.
Related Questions
. As the elements in Period 3 are considered in order of increasing atomic number, there is a general decrease inatomic massatomic radiuselectronegativityfirst ionization energy
The following Lewis structures represent valid resonance forms. true or false
Which of the following examples is a compound containing an ionic bond?A. O2 B. H2O C. CaO D. CH4
Ice (H2O) melting at 273 K and 1 atm has = 6.01 kJ/mol and = 6.01 kJ/mol while water vaporizing under the same conditions has = 37.6 kJ/mol and = 40.7 kJ/mol. Why is there such a large difference between and , but not for and ?
Answers
The difference in hardness between diamond and graphite is that diamond has an ordered arrangement of atoms within its structure that makes it harder and stronger than graphite. This is due to the high pressure and high temperature that it went.
Final answer:
Diamond is significantly harder than graphite due to its tightly packed arrangement of atoms, while graphite is soft and slippery because of its layered structure.
Explanation:
The difference in hardness between diamond and graphite can be explained by their arrangement of atoms. In diamond, each carbon atom is bonded to four neighboring carbon atoms in a tetrahedral arrangement, creating a rigid and tightly packed structure. This arrangement gives diamond its hardness. On the other hand, in graphite, each carbon atom is bonded to only three neighboring carbon atoms, forming layers that are held together by weak forces called van der Waals forces. These layers can slide past each other easily, making graphite soft and slippery.
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29.81 g/mol
48.81 g/mol
67.81 g/mol
Answers
The molar mass of BF3 is 67.81 g/mol
Explanation
- Molar mass is the mass of all atoms in a molecule in gram per mole.
- molar mass of a molecule is calculated by adding atomic mass of constituent atom
- use the periodic table to determine the atomic mass of each element in the molecule.
that is;
atomic mass of B = 10.81 g/mol
atomic mass of F = 19 g/mol
- since there 3 atoms of F in BF3 the atomic massof F in BF3= 3 x19 = 57 g/mol
- total molar mass of BF3 = 10.81 g/mol + 57 g/mol = 67.81 g/mol
67.81 g/mol is the molar mass of BF . Therefore, the correct option is option D among all the given options.
The ratio among the mass with the quantity of substance (measured within moles) in any sample of a compound of chemicals is known as the molar mass (M) in chemistry. The molar mass of a material is a bulk attribute rather than a molecular one. The compound's molecular weight is an average over numerous samples, which frequently have different masses because of isotopes. A terrestrial average or a function of the relative proportion of the isotopes of the component atoms on Earth, the molar mass is most frequently calculated using the standard atomic weights.
atomic mass of B = 10.81 g/mol
atomic mass of F = 19 g/mol
atomic massof F in BF= 3 x19 = 57 g/mol
total molar mass of BF = 10.81 g/mol + 57 g/mol = 67.81 g/mol
Therefore, the correct option is option D.
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Answers
A. lithium, beryllium, and boron
B. nitrogen, arsenic, and antimony
C. potassium, calcium, and gallium
D. cesium, platinum, and radon
Answers
Answer: The correct answer is option B.
Explanation:
Elements which lie in the same group most likely have similar chemical properties.
From the given options:
Option 1: Lithium, beryllium and boron.
Lithium lies in Group 1, Beryllium in group 2 and boron in Group 13. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.
Option 2: Nitrogen, arsenic and antimony
All these elements lie in Group 15 of the periodic table and hence will have the same properties.
Option 3: Potassium, calcium and Gallium
Potassium lies in Group 1, Calcium in group 2 and Gallium in Group 13. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.
Option 4: Cesium, Platinum and Radon.
Cesium lies in Group 1, Platinum in group 10 and Radon in Group 18. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.
Therefore, the correct option is Option B.
B. compound.
C. molecule.
D. mixture.
Answers
Answers
Answer: The alkane containing 100 hydrogens will be
Explanation:
Saturated hydrocarbons are defined as the hydrocarbons in which a single bond is present between carbon and carbon atoms.These are called as alkanes. The general formula for these hydrocarbons is
As given number of hydrogen atoms is 100, therefore the value of (2n+2) = 100
2n = 98
n = 49
Thus the formula for the alkane containing 100 hydrogens will be
Final answer:
The alkane containing 100 hydrogens has the formula C49H100.
Explanation:
The formula for the alkane containing 100 hydrogens can be determined using the general formula for alkanes, which is CnH2n+2. To find the value of n, we can set up an equation:
100 = 2n + 2
Simplifying this equation, we get:
n = 49
Therefore, the formula for the alkane containing 100 hydrogens is C49H100.
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