BBC4 年
Metals and non-metals in the periodic table
Elements in groups 6, 7 and 0 are non-metals. Atoms of group 7 elements ... See the study guide on groups in the periodic table for more information.
scmp.com9 天
Examining the periodic table of elements and how they build life – and our bodies
Our bodies require other elements, including non-metal elements such as phosphorus ... These are almost one-quarter of the periodic table and are mainly found in the first four periods.