IGNACIO MAKE UP

A core of ______ and_______grouped together surrounded by________ describes a(n) ______.

Which of the following best describes an atom?

• eletrons, neutrons, protons, atom

• protons, electrons, neutrons, atom

• protons, electrons, ions, isotope

• protons, neutrons, electrons, atom

Tags

NGSS.MS-PS1-1

Which symbol is associated with structure C?

• -

• +

• x

• no symbol

Tags

NGSS.MS-PS1-1

An element's periodic table identity is defined by its number of —

• electrons

• isotopes

• neutrons

• protons

The diagram shows an atom of an element from the periodic table.

This atom is mostly likely —

• boron, which can react and bond with magnesium.

• beryllium, which can react and bond with oxygen.

• flourine, which can react and bond with calcium.

• potassium, which can react and bond with chlorine.

Tags

NGSS.MS-PS1-1

Which of the following list the elements in order, from those having the fewest protons to those having the greatest number of protons?

• Cs, Rb, Po, At, Rn

• Ar, I, Br, Cl, F

• Li, Be, He, C, N

• N, P, As, Sb, Bi

Tags

NGSS.MS-PS1-1

The atoms of a certain element each contain 9 protons and 7 valence electrons. Which statement correctly identifies this element and describes the chemical reactivity?

• The element is oxygen, and is highly reactive.

• The element is fluorine, and is highly reactive.

• The element is oxygen, and is not very reactive.

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

Tags

NGSS.MS-PS1-1

What groups are the most reactive metals?

• 2 and 3

• 1 and 18

• 1 and 2

• 16 and 17

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What groups are the most reactive non metals?

• 1 and 2

• 16 and 17

• 2 and 17

• 1 and 16

How many valence electrons does the atom of Carbon-14, shown above have?

• 14

• 10

• 6

• 4

Tags

NGSS.MS-PS1-1

Valence electrons are electrons in the shell

• furthest from the nucleus

• closest to the nucleus

• having the lowest energy level

• that has the fastest electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2