How many valance electrons are in an Adam of each element in group 15 in the periodic table
Answers
Answer:5
Explanation:The pnictogen group, or nitrogen group, is located in column 15 of the periodic table. This family consists of the elements nitrogen, phosphorus, arsenic, antimony, bismuth, and ununpentium (N, P, As, Sb, Bi, and Uup, respectively). Each member of this family contains five valence electrons.
Nitrogen is found to have either 3 or 5 valence electrons and lies at the top of Group 15 on the periodic table. It can have either 3 or 5 valence electrons because it can bond in the outer 2p and 2s orbitals.
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Gold melts at 1064 c. Melting point is a ___.A)chemical change B)chemical propertyC)physical change D)physical property
According to ale Chateliers principle what a change is introduced into a system in chemical equilibrium the equilibrium shifts
The color of a mineral in powdered form is the mineral"s?
(2) gains three electrons and becomes a negatively charged ion
(3) loses one electron and becomes a positively charged ion
(4) loses three electrons and becomes a positively charged ion
Answers
Answer: (3) loses one electron and becomes a positively charged ion
Explanation:
Lithium bromide is formed by combination of lithium cation and bromine anion.
Electronic configuration of lithium:
Lithium atom will loose one electron to gain noble gas configuration and form lithium cation with +1 charge.
Electronic configuration of bromine:
Bromine atom will gain one electron to gain noble gas configuration and form bromide ion with -1 charge.
In lithium bromide, one electron from lithium metal gets transferred to bromine atom.
(2) gains three electrons and becomes a negatively charged ion
(3) loses one electron and becomes a positively charged ion
(4) loses three electrons and becomes a positively charged ion
Answers
Porphyry is an igneous rock that contains giant crystals surrounded by smaller crystals.
One of the most common types of rocks is an igneous rock, which is created when molten material solidifies either below or above the Earth's surface. The Latin word "ignis," which meaning fire, is where the term "igneous" gets its name. These rocks were created by the molten magma, which is a mixture of different minerals, gases, and liquids. Igneous rocks are created when magma that has risen from below the Earth's crust cools. There are two different types of igneous rocks produced by this process: intrusive and extrusive. This process can be either slow or rapid. Porphyry is an igneous rock that contains giant crystals surrounded by smaller crystals.
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B. Chromosome
C. Ribosome
D. Cytoplasm
Answers
Answer:
Chromosome
Explanation:
We inherit our genes from our parents, which we share 24 chromosomes from both of our parents. XX is female , and XY is male.
Answer:
B. Chromosome
Explanation:
Genes are contained in the Chromosome. A Chromosome contains hundreds of thousands of genes.
Answers
1. A pH meter, 2. Litmus paper/ pH test strips or 3. Titrations.
1. A pH meter works by sending a small electric current through the solution. An electrical current can only be created if there are free-moving particles such as H+ ions from an acid or OH- ions from a base. The pH meter can determine the pH by how high the conductivity is.
2. Litmus Paper or pH test strips are strips that turn a specific colour under a specific pH. This colour can then be compared to a colour chart which will tell you the pH. The downfall of this method is that the red ink will stain the strip and you will be unable to get an accurate reading.
3. A titration is the best method, if done properly, for determining pH.
Answers
Meiosis: Prophase I, Metaphase I, Anaphase I, Telophase I, Prophase II, Metaphase II, Anaphase II, Telophase II
Answers
Answer:
0.643 mol.
Explanation:
- We can use the general law of ideal gas: PV = nRT.
where, P is the pressure of the gas in atm (P = 4.0 atm).
V is the volume of the gas in L (V = 4000 mL = 4.0 L).
n is the no. of moles of the gas in mol (n = ??? mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 30ºC + 273 = 303 K).
∴ n = PV/RT = (4.0 atm)(4.0 L)/(0.0821 L.atm/mol.K)(303 K) = 0.643 mol.