2.1 Nature of Matter

A slight attraction that develops between the oppositely charged regions of nearby molecules

• hydrogen bonds
• van der Waals force
• ionic bond
• covalent bond

Center of atom that houses the protons and neutrons

• orbitals
• nucleolus
• nucleus
• isotope

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NGSS.HS-PS1-8

The basic unit of matter

• protons
• cells
• atoms
• molecules

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Bond formed when one or more electrons are transferred from one atom to another

• hydrogen
• ionic
• covalent
• electromagnetic

Negatively charged particle of an atom

• neutron
• proton
• electron
• ion

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A pure substance that consists entirely of one type of atom

• element
• molecule
• electron 
• isotope

Atoms of the same element with a different number of neutrons

• compound
• ionic
• isotope
• molecule

Bond formed when electrons are shared between atoms

• hydrogen
• unbreakable
• covalent
• ionic

Positively and negatively charged atoms

• molecule
• ions
• isotope
• electrons

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The smallest unit of most compounds

• atom
• molecule
• element
• mixture

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