Match the following Elements and Symbols

• O

• Cobalt

• Co

• Oxygen

• Fe

• Hydrogen

• Cu

• Copper

• H

• Iron

The atomic number for ​ (a)   is 48.

• Cadmium
• Copper
• Carbon
• Silver
• Indium

True or False: In an ELEMENT, protons + neutrons = electrons.

• True

• False

Answer explanation

In an element, protons = neutrons = electrons

Tags

NGSS.MS-PS1-1

How many electrons does Barium (Ba) have?

• 13

• 2

• 71

• 56

Tags

NGSS.MS-PS1-1

Mass number ​ (a)   protons ​ (b)   neutrons

• =
• +
• -
• *
• /
• >
• <

The atomic number equals the number of

• neutrons

• protons

• nuclei

• orbitals

Carbon-14 has a mass number of ​ (a)   and ​ (b)   neutrons.

• 14
• 8
• 6
• 10
• 12
• 16

Tags

NGSS.MS-PS1-1

Isotopes of elements have the same number of protons and ​ (a)   , but a different number of ​ (b)   .

• electrons
• neutrons
• ions
• hydrogens
• nucleus
• ionic bonds

What is the atomic number of iron?

• 26

• 58

• 103

• 2

How many protons does radium have?

• 88

• 226

• 138

• 90