atomic number

Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++

Related topics: Chemistry

aˌtomic ˈnumber noun [uncountable] technical the number of protons in the nucleus (=central part) of an atom 原子序数

atomic number
aˌtomic ˈnumber

noun [uncountable] technical
the number of protons in the nucleus (=central part) of an atom

atomic number

BrE

/əˌtɒmɪk ˈnʌmbə(r)/

NAmE

/əˌtɑːmɪk ˈnʌmbər/

noun

(

chemistry 化学

)

the number of protons in the

of an atom, which is characteristic of a chemical element. Elements are placed in the

periodic table

(= centre)

of an atom, which is characteristic of a chemical element. Elements are placed in the

periodic table

according to their atomic numbers. 原子序数（指原子在元素周期表中的序号）