True, An atom is the basic unit of matter., The nucleus is at the centre of an atom., Protons have a positive charge., Neutrons have no electrical charge., Electrons have a negative charge., Electrons orbit the nucleus., Atoms are neutral when they have equal numbers of protons and electrons., An atom is the smallest unit of a chemical element., An element contains only one type of atom., The nucleus contains protons and neutrons., False, An atom is the largest unit of matter., The nucleus is outside the atom., Protons have a negative charge., Neutrons have a positive charge., Electrons have a positive charge., Electrons are inside the nucleus., Atoms are always positively charged., An atom is the largest unit of a chemical element., An element contains different types of atoms., The nucleus contains only electrons.

true false

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？