By the way...... what do those symbols for the elements have in common (for number 7-11): Pb, Au, Cu, Hg, Na ? *
Answers
Answer:
Na number of 11
Explanation:
Pb no. 82
Au no. 79
Cu no. 29
Hg no. 80
Answer:
those have symbols for their Latin or Greek name
Explanation:
hope it helps
Related Questions
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Which trends are observed when the elements in Period 3 on the Periodic Table are considered in order of increasing atomic number?(1) The atomic radius decreases, and the first ionization energy generally increases. (2) The atomic radius decreases, and the first ionization energy generally decreases. (3) The atomic radius increases, and the first ionization energy generally increases. (4) The atomic radius increases, and the first ionization energy generally decreases.
Diamond has a density of 3.52 g/ml. what is the volume in cubic centimeters of a diamond with a mass of 15.1 g? 4.3 cm3 4.29 cm3
Answers
The concentration of gallium in kilograms per cubic meter is equal to the calculated mass of gallium per cubic meter.
To determine the concentration of gallium in kilograms per cubic meter, we need to convert the concentration from atomic percent (at%) to kilograms per cubic meter.
The atomic fraction is the ratio of the number of gallium atoms to the total number of atoms in the silicon-gallium mixture.
We need to know the atomic masses of gallium and silicon. The atomic mass of gallium is 69.72 g/mol, and the atomic mass of silicon is 28.09 g/mol.
The atomic fraction of gallium can be calculated using the formula:
Atomic fraction of gallium = (Concentration of gallium in at%) / (Atomic mass of gallium) / [(Concentration of gallium in at%) / (Atomic mass of gallium) + (Concentration of silicon in at%) / (Atomic mass of silicon)]
Plugging in the given values:
Atomic fraction of gallium = (%) / (69.72 g/mol) / [(
at%) / (69.72 g/mol) + (100 -
) at% / (28.09 g/mol)]
Now, let's convert the atomic fraction to the number of gallium atoms per cubic meter. We can use Avogadro's number, to make this conversion.
Number of gallium atoms per cubic meter = Atomic fraction of gallium × Avogadro's number.
Mass of gallium per cubic meter = Number of gallium atoms per cubic meter × (Atomic mass of gallium / 1000)
Therefore, the concentration of gallium in kilograms per cubic meter is equal to the calculated mass of gallium per cubic meter.
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Final answer:
The concentration of gallium in kilograms per cubic meter can be calculated using the atomic mass of gallium and Avogadro's number.
Explanation:
To calculate the concentration of gallium in kilograms per cubic meter, we can use the atomic mass of gallium and Avogadro's number. The concentration in kilograms per cubic meter can be found using the formula:
Concentration (kg/m³) = Concentration (% by mass) x Density (g/cm³) x Atomic Mass (g/mol) / 1000 x Avogadro's Number
First, convert the concentration from at% (atomic percent) to % by mass. Since gallium has an atomic mass of 69.7 g/mol, we can use this value to find the concentration in kilograms per cubic meter.
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Answers
Answer:
true
true
Explanation:
pki points nmn po
Answers
Answer:
CH4
Explanation:
I got it wrong and it should me the right answer
b.The reaction cannot occur because water is a reactant.
c.Copper has a higher activity than hydrogen and cannot replace it.
d.The reaction proceeds too slowly to create products.
Answers
The reason why H₂O +Cu does not proceed to a product is that
copper has a lower activity than hydrogen and cannot replace it (answer A)
Explanation
Replacement reaction is type of a reaction in which element react with compound and take place of another element in that compound.
That is the more reactive element replaces the less reactive element from it's compound.
Since H₂ is more reactive than Cu in reactivity series therefore no reaction occur between H₂O +Cu since Cu cannot replace H₂ from its compound.
b. exposure to toxic chemicals
c. the net charge of the atom
d. the attraction of protons to electrons
e. an unstable ratio of protons and neutrons
Answers
The answer is: e. an unstable ratio of protons and neutrons.
Neutrons stabilize the nucleus, because they attract protons and reduce electrical repulsion between protons.
The larger is neutron-proton ratio, the higher is probability for nuclear decay.
Ratio of protons to neutrons in a stable atom is 1 : 1.
For example, nitrogen atom (N-14) has 7 protons (p⁺) and 7 neutrons (n°). The neutron–proton ratio (N/Z ratio or nuclear ratio) is 7 : 7 ( 1 : 1 ).
Another example, neon atom (Ne-20) has 10 protons (p⁺) and 10 neutrons (n°). The neutron–proton ratio is 10 : 10 ( 1 : 1 ).
The neutron–proton ratio generally increases with increasing atomic number.
Answers
protons= positive
electrons= negative
Neutrons: Neutral, it means no charge at all
Protons: Positive
Electrons: Negative