Help, 7th grade questions, 1st year math problems, help

Noble gas, helium, diatom: oxygen.

Polyatomic molecule: methane.

Elemental atom: silicon dioxide.

This doesn't seem to be physical.

1.Metals, rare gases, etc. etc.

No, it seems to be asking for a simple quality!

Please, halogen elemental (chlorobromoiodine) is also an atomic crystal? I'm ......

Metals are made up of metal cations and free electrons, and they have nothing to do with atoms.

In addition to noble gases, there are crystalline silicon and diamond.

Elemental matter made of atoms can only be atomic crystals and metals!

None of the upstairs are right!

Needless to say, metal.

The only elements in atomic crystals are halogen elements (chlorochlorobromide-iodine) and noble gases.

You'll find out if you work on your own.

1.Noble Gases 2Oxygen, hydrogen, nitrogen, fluorine, chlorine, iodine, bromine.

3.Ozone Soccer Ene 4metals, noble gases, etc

1. Monoatomic molecules are noble gases. Metals have no molecules. It's all atoms.

2. Hydrogen is special, oxygen, chlorine, and oxidizing atoms generally constitute diatomic molecules.

3. Polyatomic molecules. A lot, generally.

4. Metal. Elemental matter is what distinguishes it from impurities, that is, it is pure without other substances.

Equal ab cd AEF + CFE=180° (two straight lines are parallel, complementary to the lateral internal angles).

i.e. AEF+ QFE+ CFQ=180°

and aep= cfq aef+ qfe+ aep=180°, i.e. pem+ qfe=180°

PE QF (complementary to the lateral inner angle, two straight lines parallel).

EPM = FQM (two straight lines are parallel and the isotope angles are equal).

Equal!

Because PE QF can be certified

The square of the big ant erects the cube of a.

The square of b is the rolling cube of b.

2.When the maximum value is x+y=0.

3。The two shapes correspond to the point of the line.

6.Q: What is the total distance from A to Wuxiao B?

Let the total distance from A to B be x (km).

According to the meaning of the question (x 3) 60 + (2 x 3) 100 = solution x = 180 (km).

The square of a cube.

The square of b is the cube of b.

2.When the maximum value is x+y=0.

3。The two graphs correspond to the subtle inventory of the line.

6.The first third of the journey took x hours. The second third of the journey took Y hours.

x+y=60x*3=100y

Then figure it out for yourself. Give me a share!!

Let the 3 numbers be a, b, c, and have [(2a+5)*5+b]*10+c=100a+10b+c+250, so give the calculated number minus 250, and then say the remaining three digits in turn to be the three numbers selected.