CHEMISTRY HIGH SCHOOL

Select all that apply.1: Which of the following particles are of approximately equal mass?

A: protons
B:electrons
C:neutrons
D:quarks
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2: If the atomic number of an element is 16, then it has 16 electrons.

True
False
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3: An unknown substance is tested and found to have the following physical properties:

brittle
fair conductor of electricity
dull (not shiny)

The substance is most likely a _____.

A:metal
B:metalloid
C:nonmetal
D:can not be determined without more data
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Answers

Answer 1
Answer:

1)Protons and Neutrons have approximately equal masses

2)TRUE

3) B-Metalloid
Answer 2
Answer:

Answer:

its a and b

Explanation:

i got it right on test

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Explain, in terms of atomic structure, why the radius of an Na atom is larger than the radius of an Na+ ion.

Answers

 In a Naatom, there are 11 protons controlling 11 electrons by electrostatic attraction. In Na+ there are 11 protons controlling 10 electrons (you lost one to give Na+), so they can pull them in tighter!!

How many electrons would be found in an isotope of silicon 29

Answers

14 electrons15 neutrons

Answer: 14

Explanation: Founders Educere answer.

Good luck my fellow summer school students, I love you all.

Please rate, thanks, & vote brainliest, I want a rank up already.

chlorine has 7 outer energy level electrons and argon has 8. what is the difference in the reactivity of these two elements?

Answers

chlorine is more reactive than argon, because argon is not reactive at all. Chlorine only has to gain 1 valence electron
Chlorine is highly reactive as it seeks to gain an extra electron to balance its outer shell (max 8) and argon is stable because it has a stable outer shell

A specific amount of energy is emitted when excited electrons in an atom in a sample of an element return to the ground state.This emitted energy can be used to determine theA) mass of the sample
B) volume of the sample
C) identity of the element
D) number of moles of the element

Answers

The answer is C. The specific amount of energy emitted when electrons jump from excited states to the ground state refers to emission spectrum. The energy is emitted in the form of photons, and the photons have very specific wavelengths (energy) that correspond to the energy gaps between the excited states and the ground state. The specific wavelengths of light emitted are referred to as the "emission spectrum," and each element produces a different emission spectrum. Thus, this emitted energy can be used to identify the element from which your sample was taken.

Answer:

C.

Explanation:

Complete the formula. density = _____ weight/volume weight/length mass/length mass/volume

Answers

Answer: Option (d) is the correct answer.

Explanation:

Density is defined as mass per unit volume.

Mathematically,            d = (m)/(v)

where                     d = density

                              m = mass

                               v = volume

Density is also known as degree of compactness, that is, more closely the atoms are linked more will be the mass of object or atom. Hence, more will be its density.

Thus, we can conclude that density = (mass)/(volume)
mass/volume cause you divide to get density
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