Calcule el volumen de reactivo concentrado requerido para preparar las disoluciones diluidas indicadas: a) H3PO4 15 M para preparar 750 mL de H3PO4 3.0 M
b) HNO3 16 M para preparar 250 mL de HNO3 0.50 M

Two atoms interact with each other as shown by the equation. complete the equation by filling in the missing parts. 1 2 3 4 5 h he li

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons