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lorasvet [3.4K]
2 years ago
12

Write the symbols of following elements. a. Phosphorus b. Bromine c. Silver d. Sodium

Chemistry
1 answer:
Vikki [24]2 years ago
7 0

Answer:

a. P

b. Br

c. Ag

d. Na

Explanation:

The Periodic Table says so

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Which type(s) of matter would need to be separated by chemical methods?
Marta_Voda [28]

Answer:

solids, liquids, gases, or plasma

Explanation:

In chemistry, a chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components without breaking chemical bonds. Chemical substances can be solids, liquids, gases, or plasma

3 0
3 years ago
the radius of a palladium atom is 137 pm. how many palladium atoms would have to be laid side by side to span a distance of 4.25
Rudiy27
4.25mm / 137pm = 31 021 897.8
7 0
2 years ago
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write down the way you had to behave to illustrate the behavior of particles as a gas condenses to form a liquid
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3 0
1 year ago
A 0.4272 g sample of an element contains 2.241 x 10 ^21 atoms . what is the symbol of the element?
grin007 [14]

Answer:

Likely \rm In (indium.)

Explanation:

Number of atoms: N = 2.241 \times 10^{21}.

Dividing, N, the number of atoms by the Avogadro constant, N_A \approx 6.023 \times 10^{23} \; \rm mol^{-1}, would give the number of moles of atoms in this sample:

\begin{aligned} n &= \frac{N}{N_{A}} \\ &\approx \frac{2.241 \times 10^{21}}{6.023 \times 10^{23}\; \rm mol^{-1}} \approx 3.72 \times 10^{-3}\; \rm mol \end{aligned}.

The mass of that many atom is m = 0.4272\; \rm g. Estimate the average mass of one mole of atoms in this sample:

\begin{aligned}M &= \frac{m}{n} \\ &\approx \frac{0.4272\; \rm g}{3.72 \times 10^{-3}\; \rm mol} \approx 114.82\; \rm g \cdot mol^{-1}\end{aligned}.

The average mass of one mole of atoms of an element (114.82\; \rm g \cdot mol^{-1} in this example) is numerically equal to the average atomic mass of that element. Refer to a modern periodic table and look for the element with average atomic mass 114.82. Indium, \rm In, is the closest match.

5 0
3 years ago
What type of reaction is this?
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Decomposition

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