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Basile [38]
3 years ago
6

Which tool is used to measure mass?

Chemistry
2 answers:
sashaice [31]3 years ago
7 0

Answer: The Awnser Is B. Balance

Explanation:

kherson [118]3 years ago
3 0

Answer: c. balance

Explanation: Mass is the amount of matter contained in a body.

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Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 15.4 u.
mixas84 [53]

Answer:

N, B, Be, C

Explanation:

N (Nitrogen) has 14.0067 B (Boron) has 10.81 Be (Beryllium) has 9 and C (Carbon) has 12

8 0
2 years ago
An atom of lithium (Li) forms an ionic bond with an atom of chlorine (Cl) to form lithium chloride. How are the valence electron
miskamm [114]

Answer: Option (D) is the correct answer.

Explanation:

Atomic number of lithium is 3 and electrons in its shell are distributed as 2, 1. Atomic number of chlorine is 17 and electrons in its shell are distributed as 2, 8, 7.

Thus, we can see that lithium has 1 extra electron and chlorine has deficiency of 1 electron. Therefore, in order to gain stability lithium will transfer its 1 extra electron to chlorine atom.

Thus, we can conclude that electrons are transferred from the lithium atom to the chlorine atom.

6 0
3 years ago
Read 2 more answers
Why aren't noble gases reactively ?
Ket [755]
Because noble gases  already have full shells of electrons therefore meaning they do not need to react to form anything.Whereas if they had 1 electron short of full shells , they would become VERY reactive.
5 0
3 years ago
Read 2 more answers
A Se ion has a mass number of 79 and a charge of − 2 . Determine the number of neutrons, protons, and electrons in this ion.
posledela

Answer:

45, 34, 36

Explanation:

The atomic number of Selenium is 34 and the atomic number is 79 also the atom has gained two electron denoted by superscript -2

number of neutrons = mass number - atomic number = 79 - 34 = 45

number of proton = atomic number = 34

number of electron = 34 + 2 = 36. In an atom the number of proton is always equal to number of electron if the atom is neutral but this Se atom has gain two so the number of electron will exceed the number of proton by 2.

8 0
3 years ago
What is the heaviest noble gas? <br><br> A.Helium<br> B.Radon<br> C.Fluorine<br> D.Astatine
Ira Lisetskai [31]

Answer:

                   Radon is the heaviest Noble Gas

Explanation:

                    This statement is very easy to be solved. As we know that Noble Gases are group of Elements which have complete valence shell and are stable elements and don't react easily and hence, are found in mono-atomic form in nature. These elements can be found on the extreme right of the periodic table in group 8 or group 18. Following are the Noble elements,

                             (i) Helium

                             (ii) Neon

                             (iii) Argon

                             (iv) Xenon

                             (v) Radon

Now,

In statement we are provided with only two noble gases i.e. Helium and Radon. Therefore, it is easy among them to finalize the heaviest one as Radon having atomic mass of 222.02 g/mol and atomic radii of 0.22 nm is much denser/heavier than Helium having atomic mass of 4.0 g/mol and atomic radii of 0.122 nm.

5 0
3 years ago
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