As children move towards middle and late childhood, the relationship between physical activity and motor skill competence evolves and strengthens (Stodden et al. 2008). During middle childhood, a childâs perceived motor competence more closely estimates their actual motor skill competence.
In 1842 Gustav Mosander separated yttria, found in the mineral gadolinite, into three fractions which he called yttria, erbia, and terbia. The names erbia and terbia became confused in this early period. After 1860, Mosander's terbia was known as erbia, and after 1877, the earlier known erbia became terbia. The erbia of this period was later shown to consist of five oxides, now known as erbia, scandia, holmia, thulia and ytterbia.
Erwin SchrÃ¶dingerâs contributions to the atomic model came after the Bohr model of the atom , in relation to SchrÃ¶dingerâs work in quantum physics and to the SchrÃ¶dinger equation: In 1926 Erwin SchrÃ¶dinger, an Austrian physicist, took the Bohr atom model one step further. SchrÃ¶dinger used mathematical equations to describe the likelihood of finding an electron in a certain position.