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kupik [55]
3 years ago
7

Which of the following best describe an atomic number? An element identity is defined by its atomic number this means it represe

nts the number of
Chemistry
1 answer:
olga2289 [7]3 years ago
5 0

a)Atomic number is the number of protons in the nucleus of an atom.

b)atomic number represents the number of protons

You might be interested in
What is atom economy?
bonufazy [111]

Answer:

The conversion efficiency of a chemical process.

Explanation:

Hope this helps!

5 0
3 years ago
Choose the correct total number of electron domains (bonding and nonbonding) about a central atom if the angle(s) between the el
slamgirl [31]

Answer:

The central atom has 3 electron domains.

Explanation:

According to the Valence Shell electron pair repulsion theory (VSEPR) put forward by Gillespie and Nyholm in 1957, the shape of a molecule is determined by repulsion between all the electron pairs (electron domains) present in the valence shell.

The electron pairs or electron domains are known to position themselves as far apart in space as possible in order to minimize repulsions.

Hence, when the central atom of a molecule contains three electron domains, they are positioned at an angle of 120° from each other to minimize repulsions. Hence the answer.

5 0
3 years ago
There are three naturally occurring isotopes of the hypothetical element hilarium 45Hi, 46Hi, and 48Hi. The percentages of these
den301095 [7]

Answer:

46.761g/mol

Explanation:

Given parameters:

Element = Hilarium , Hi

Isotopes: Hi- 45, Hi-46 and Hi- 48

Natural abundance of Hi-45 = 18.3%

                                     Hi-46 = 34.5%

                                     Hi-48 = 47.2%

Unknown:

Atomic weight of naturally occurring Hilarium = ?

Solution:

Isotopes have been studied extensively by mass spectrometry. The method is used to determine the proportion/percentage/fraction by which each of the isotopes of an element occurs in nature. The proportion is called geonormal abundance. From this we can calculate the atomic weight of an element.

 We can use the expression below to find this value:

       Atomic weight = m₄₅α₄₅ + m₄₆α₄₆ + m₄₈α₄₈

    m is the atomic mass of each isotope and α is the abundance

Atomic weight = (45 x \frac{18.3}{100} ) + (46 x  \frac{34.5}{100} ) + (48 x  \frac{47.2}{100})

Atomic weight of Hi = 8.235 + 15.870 +  22.656 = 46.761g/mol

6 0
3 years ago
PLEASE I NEED HELP!!!Using the table below, identify the unknown material that has a mass of 15,06 g and a
s2008m [1.1K]

The unknown material : gold

<h3>Further explanation  </h3>

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

Density formula:  

\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}

ρ = density  

m = mass  

v = volume  

mass of unknown material : 15.06 g

volume : 0.78 ml

The density of unknown material :

\tt \rho=\dfrac{15.06}{0.78}\\\\\rho=19.31~g/ml

Materials that match the density: gold

7 0
3 years ago
Agree or disagree with which one and provide evidence thank you!!!!!!!:)​
forsale [732]

Answer:number 2

Explanation:

the definition of photosynthesis is that carbon dioxide and water changes into sugar and oxygen

3 0
3 years ago
Read 2 more answers
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