Chemistry GCSE unit 2

(i)what are the elements in order of?

(ii)In the elements properties there are?

(iii)What are the veritcal coloumns?

(v)The elements of a group have?

(iv)What are the horizontal rows?

(i)elements are arranged in order of proton number.

(ii)there are repeating patterns in the elements properties

(iii)the vertical columns are groups

(v)the elemements of a group have similar properties

(iv)horizontal rows are periods.

whats the meaning and safety precautions?

Toxic. can cause death if absorbed by skin, swallowed or breathed in.

Wear eye protection, wear gloves, work in a fume cupboard or wear a mask over mouth and nose.

what does this sign mean and the safety precautions?

corrosive- attacks living tissue like eyes or skin

wear gloves and eye protection

whats the meaning and safety precautions?

harmful-like toxic substances but less dangerous.

wear eye protection and wash off spills quickly and use in a well ventilated room. 

OR 

Irritant makes skin red or blistered,

wash off spills quickly and wear eye protection.

what do these two signs mean and the safety precautions ?

highly flammable- catches fire easily. 

keep away from flames, sparks and oxidising chemicals and wear eve protection.

oxidising- provides oxygen so other chemical burn more fiercely. 

keep away from flammable chemicals and wear eye protection