Basic Knowledge

The smallest particle of any particular type of matter is known by which of the following terms?

• Compound

• Atom

• Chemical

• Element

all matter is made of what 

• energy 

• atoms 

• electrons 

• compounds 

Tags

NGSS.MS-PS1-1

Which of the following groups contains members with a similar chemical reactivity?

• Be, Mg, Sr

• C, N, Br

• Sc, Y, Zr

• Li, Be, C

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?

• The element is fluorine, and it is highly reactive.

• The element is sodium, and it is highly reactive.

• The element is fluorine, and it is not very reactive.

• The element is sodium, and it is not very reactive.

Which element does the Bohr- diagram represent?

• Boron

• carbon

• sodium

• oxygen

Tags

NGSS.MS-PS1-1

The central region of an atom where its neutrons and protons are is its 

• nucleus 

• electron cloud

• core 

• center 

What is the atomic number for an element with three protons?

• 2

• 1

• 3

• 6

Which of these atoms is likely the least reactive?

• neon

• carbon

• sodium

• hydrogen

Which statement about the atomic nucleus is correct?

• The nucleus is made of protons and neutrons and has a negative charge

• The nucleus is made of protons and neutrons and has a positive charge

• The nucleus is made of electrons and has a positive charge

• The nucleus is made of electrons and has a negative charge

An atom's mass number equals the number of...

• protons plus the number of electrons

• protons plus the number of neutrons

• protons

• neutrons