Crystals can be divided into four categories according to their structural particles and forces: ionic crystals, atomic crystals, molecular crystals and metal crystals.

Atomic crystals: common atomic crystals are some simple substances and some compounds of the fourth group A elements in the periodic system, such as diamonds, silicon crystals, SiO2, SiC, etc.

Ionic crystal: A crystal formed by bonding ions between ions. (Quite a lot)

Metallic crystals: Metallic elements and some metal alloys are metallic crystals, such as magnesium, aluminum, iron and copper.

Molecular crystal: a crystal formed by the combination of molecules with van der Waals force. Most nonmetallic simple substances and their compounds, such as dry ice (CO2), I2, and most organic substances, are molecular crystals in their solid state.

The chemical formula of a salt or salt is the simplest structure of XmYn. When a certain amount of the salt is dissolved in sufficient water

The substances formed by elements in the short cycle can be hydrolyzed by NaH, MgH2, MgS, SiCl4, PCl3, PCl5, etc

The common feature when reacting with water is that positive elements combine with OH, and negative elements combine with H to generate corresponding substances

The ones that meet the meaning of the question are

(1) It can be+=2Al (OH) 3 ↓+↑, or SiCl4+=↓+4HCl ↑

(2) It can be+=3Mg (OH) 2 ↓+2NH3 ↑, or MgH2+=Mg (OH) 2 ↓+2H2 ↑

(3) It can be NaH+=NaOH+H2 ↑

Chemical Formula of Aluminum Boride

-2alB2

Chemistry: What is the crystal type of aluminum borate

It should be ionic crystal.

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