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熟练而准确书写化合物的化学式 ,必须做到以下几点 :一、熟记常见元素 (原子团 )的化合价熟记化合价是正确书写化合物化学式的必要条件 .记忆时 ,首先将常见元素 (原子团 )的化合价编成下列韵语 :- 1氢硝根和氯 ;- 2氧和碳硫根 ;+1铵钾钠银氢 ;+2钙镁钡铜锌 (注 :“氢硝根”是?
To formulate the chemical formula of a compound skillfully and accurately, it is necessary to do the following: 1. Memorize the valence of the common element (atom group). The memorization is the necessary condition for the correct writing of the chemical formula of the compound. When memorizing, the valence of the common element (atomic group) is first The following rhymes have been compiled: - 1 Hydrogen nitrate and chlorine; - 2 Oxygen and carbon-sulfur radicals; +1 ammonium potassium sodium hydrogen; + 2 Calcium magnesium barium copper and zinc (Note: “hydrogen nitrate” is?