Ask question

Ask question

All categories

3 years ago

6

Elements may have similar properties and we can use the periodic table to help us determine what they are. These three elements

are alike in many ways but they do not share ALL properties. What property do these elements NOT have in common?

2 answers:

Reil [10]3 years ago

8 0

They don’t have the Noble gases

Vika [28.1K]3 years ago

7 0

Answer:

same number of valence electrons

Explanation:

You might be interested in

What is true of a molecule

kobusy [5.1K]

Answer:

All molecules of a compound have the same properties

Explanation:

Molecules are particles of elements or compounds that are made of more than one atoms.
Molecules of an element are made up of similar atoms. For example, Oxygen molecule, O₂, has two oxygen atoms and chlorine molecule, Cl₂, has two chlorine atoms.
Molecules of a compound are made up of different types of atoms, for example, a water molecule, H₂O is made up of two hydrogen atoms and one oxygen atom.
Molecules of a compound have similar properties that are similar to that of the compound. The properties of a molecule of a compound are different from those of an individual atom.

6 0

3 years ago

What is the mass of a sample of NH3 containing 3.80 x 1024 molecules of NH3? (5 points)

AnnyKZ [126]

Answer: 107 grams

Explanation: got it right on the test

8 0

3 years ago

Help please it's due in 12 hours<br> (20 points)

Rufina [12.5K]

Answer:

1) K and Rb

2) 20 protons, 20 neutrons, and 20 electrons.

Explanation:

1) If it's in the same column, it has the same # of valence electrons (e- on the outer shell), therefore similar chemical properties.

2)

1) atomic #, 20, is the number of protons

2) subtract the mass number from # of protons, which you get 20 neutrons

3) Number of electrons in a neutral atom = number of electrons, which is 20. You can also check yourself by looking at electron configuration on a full periodic table.

8 0

2 years ago

Which reactions are oxidation-reduction reactions? Check all that apply

tia_tia [17]

2 Na + Cl₂ → 2 NaCl

Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag

CH₄ + 2 O₂ → CO₂ + 2 H₂O

are oxidation-reduction reactions

Explanation:

In the oxidation-reduction reaction there is a component which accept electrons and it is reduced and another component which donates electrons and it is oxidized.

Now in the case of the reaction of copper (Cu) with silver nitrate (AgNO₃):

Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag

Cu⁰ with a oxidation number 0 donates 2 electrons⁻ and is transformed in Cu⁺² with the oxidation number 2+.

Ag⁺ with a oxidation number 1+ accepts 1 electron⁻ and is transformed in Ag with the oxidation number 0.

In the case of CH₄ + 2 O₂ → CO₂ + 2 H₂O reaction we have:

C⁴⁻ with a oxidation number +4 donates 8 electrons⁻ and is transformed in C⁴⁺ with the oxidation number 4+.

O⁰ with a oxidation number 0 accepts 2 electrons⁻ and is transformed in O²⁻ with the oxidation number 2-.

And in the case of 2 Na + Cl₂ → 2 NaCl reaction we have:

Na⁰ with a oxidation number 0 donates 1 electron⁻ and is transformed in Na⁺ with the oxidation number 1+.

Cl⁰ with a oxidation number 0 accepts 1 electron⁻ and is transformed in Clwith the oxidation number 1-.

Learn more about:

oxidation-reduction reactions

brainly.com/question/4222605

brainly.com/question/10725245

brainly.com/question/10211542

#learnwithBrainly

4 0

3 years ago

What mineral has 2 sugar-cube sized, irregularly shaped pieces. Brassy-yellow in color with metallic luster. Flat surfaces look

Vilka [71]

<u>Answer:</u>

<em>The mineral we are talking about here is olivine.</em>

<u>Explanation:</u>

It is a bit dark in color which ranges between yellow to Green to olive green. The luster present in it is nonmetallic luster but has a glassy finish and a substance hardness that is ranging between 6.5 to 7.

This mineral has granular masses which we can say has mass like sugar grains. This mineral has cleavage with conchoidal fracture present in it.

3 0

4 years ago